From 659bae0228ead472070dc5e6fff64f4b24ea045a Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Wed, 26 Jun 2024 14:05:07 +0000
Subject: [PATCH 1/6] chore: add DRPC server implementation for network
 telemetry

---
 coderd/agentapi/api.go        |  40 +-
 coderd/coderd.go              |  24 +-
 coderd/telemetry/telemetry.go | 305 +++++++++++
 coderd/workspaceagentsrpc.go  |  24 +-
 tailnet/proto/tailnet.pb.go   | 979 ++++++++++++++++++----------------
 tailnet/proto/tailnet.proto   |  37 +-
 tailnet/service.go            |  95 +++-
 7 files changed, 1001 insertions(+), 503 deletions(-)

diff --git a/coderd/agentapi/api.go b/coderd/agentapi/api.go
index 4e5e30ad9c761..37c84a966f4cb 100644
--- a/coderd/agentapi/api.go
+++ b/coderd/agentapi/api.go
@@ -23,6 +23,7 @@ import (
 	"github.com/coder/coder/v2/coderd/externalauth"
 	"github.com/coder/coder/v2/coderd/prometheusmetrics"
 	"github.com/coder/coder/v2/coderd/schedule"
+	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/tracing"
 	"github.com/coder/coder/v2/coderd/workspacestats"
 	"github.com/coder/coder/v2/codersdk"
@@ -47,6 +48,7 @@ type API struct {
 
 	mu                sync.Mutex
 	cachedWorkspaceID uuid.UUID
+	drpcServiceClose  func()
 }
 
 var _ agentproto.DRPCAgentServer = &API{}
@@ -65,15 +67,18 @@ type Options struct {
 	AppearanceFetcher                 *atomic.Pointer[appearance.Fetcher]
 	PublishWorkspaceUpdateFn          func(ctx context.Context, workspaceID uuid.UUID)
 	PublishWorkspaceAgentLogsUpdateFn func(ctx context.Context, workspaceAgentID uuid.UUID, msg agentsdk.LogsNotifyMessage)
-
-	AccessURL                 *url.URL
-	AppHostname               string
-	AgentStatsRefreshInterval time.Duration
-	DisableDirectConnections  bool
-	DerpForceWebSockets       bool
-	DerpMapUpdateFrequency    time.Duration
-	ExternalAuthConfigs       []*externalauth.Config
-	Experiments               codersdk.Experiments
+	NetworkTelemetryBatchFn           func(batch []telemetry.NetworkEvent)
+
+	AccessURL                      *url.URL
+	AppHostname                    string
+	AgentStatsRefreshInterval      time.Duration
+	DisableDirectConnections       bool
+	DerpForceWebSockets            bool
+	DerpMapUpdateFrequency         time.Duration
+	NetworkTelemetryBatchFrequency time.Duration
+	NetworkTelemetryBatchMaxSize   int
+	ExternalAuthConfigs            []*externalauth.Config
+	Experiments                    codersdk.Experiments
 
 	// Optional:
 	// WorkspaceID avoids a future lookup to find the workspace ID by setting
@@ -154,15 +159,24 @@ func New(opts Options) *API {
 	}
 
 	api.DRPCService = &tailnet.DRPCService{
-		CoordPtr:               opts.TailnetCoordinator,
-		Logger:                 opts.Log,
-		DerpMapUpdateFrequency: opts.DerpMapUpdateFrequency,
-		DerpMapFn:              opts.DerpMapFn,
+		CoordPtr:                       opts.TailnetCoordinator,
+		Logger:                         opts.Log,
+		DerpMapUpdateFrequency:         opts.DerpMapUpdateFrequency,
+		DerpMapFn:                      opts.DerpMapFn,
+		NetworkTelemetryBatchFrequency: opts.NetworkTelemetryBatchFrequency,
+		NetworkTelemetryBatchMaxSize:   opts.NetworkTelemetryBatchMaxSize,
+		NetworkTelemetryBatchFn:        opts.NetworkTelemetryBatchFn,
 	}
+	api.drpcServiceClose = api.DRPCService.PeriodicTelemetryBatcher()
 
 	return api
 }
 
+func (a *API) Close() error {
+	a.drpcServiceClose()
+	return nil
+}
+
 func (a *API) Server(ctx context.Context) (*drpcserver.Server, error) {
 	mux := drpcmux.New()
 	err := agentproto.DRPCRegisterAgent(mux, a)
diff --git a/coderd/coderd.go b/coderd/coderd.go
index 288eca9a4dbaf..292b0cb171574 100644
--- a/coderd/coderd.go
+++ b/coderd/coderd.go
@@ -142,14 +142,16 @@ type Options struct {
 	DERPServer         *derp.Server
 	// BaseDERPMap is used as the base DERP map for all clients and agents.
 	// Proxies are added to this list.
-	BaseDERPMap                 *tailcfg.DERPMap
-	DERPMapUpdateFrequency      time.Duration
-	SwaggerEndpoint             bool
-	SetUserGroups               func(ctx context.Context, logger slog.Logger, tx database.Store, userID uuid.UUID, orgGroupNames map[uuid.UUID][]string, createMissingGroups bool) error
-	SetUserSiteRoles            func(ctx context.Context, logger slog.Logger, tx database.Store, userID uuid.UUID, roles []string) error
-	TemplateScheduleStore       *atomic.Pointer[schedule.TemplateScheduleStore]
-	UserQuietHoursScheduleStore *atomic.Pointer[schedule.UserQuietHoursScheduleStore]
-	AccessControlStore          *atomic.Pointer[dbauthz.AccessControlStore]
+	BaseDERPMap                    *tailcfg.DERPMap
+	DERPMapUpdateFrequency         time.Duration
+	NetworkTelemetryBatchFrequency time.Duration
+	NetworkTelemetryBatchMaxSize   int
+	SwaggerEndpoint                bool
+	SetUserGroups                  func(ctx context.Context, logger slog.Logger, tx database.Store, userID uuid.UUID, orgGroupNames map[uuid.UUID][]string, createMissingGroups bool) error
+	SetUserSiteRoles               func(ctx context.Context, logger slog.Logger, tx database.Store, userID uuid.UUID, roles []string) error
+	TemplateScheduleStore          *atomic.Pointer[schedule.TemplateScheduleStore]
+	UserQuietHoursScheduleStore    *atomic.Pointer[schedule.UserQuietHoursScheduleStore]
+	AccessControlStore             *atomic.Pointer[dbauthz.AccessControlStore]
 	// AppSecurityKey is the crypto key used to sign and encrypt tokens related to
 	// workspace applications. It consists of both a signing and encryption key.
 	AppSecurityKey workspaceapps.SecurityKey
@@ -305,6 +307,12 @@ func New(options *Options) *API {
 	if options.DERPMapUpdateFrequency == 0 {
 		options.DERPMapUpdateFrequency = 5 * time.Second
 	}
+	if options.NetworkTelemetryBatchFrequency == 0 {
+		options.NetworkTelemetryBatchFrequency = 1 * time.Minute
+	}
+	if options.NetworkTelemetryBatchMaxSize == 0 {
+		options.NetworkTelemetryBatchMaxSize = 1_000
+	}
 	if options.TailnetCoordinator == nil {
 		options.TailnetCoordinator = tailnet.NewCoordinator(options.Logger)
 	}
diff --git a/coderd/telemetry/telemetry.go b/coderd/telemetry/telemetry.go
index 91251053663f5..d2dfbaba44204 100644
--- a/coderd/telemetry/telemetry.go
+++ b/coderd/telemetry/telemetry.go
@@ -20,6 +20,8 @@ import (
 	"github.com/google/uuid"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/xerrors"
+	"google.golang.org/protobuf/types/known/durationpb"
+	"google.golang.org/protobuf/types/known/wrapperspb"
 
 	"cdr.dev/slog"
 	"github.com/coder/coder/v2/buildinfo"
@@ -27,6 +29,7 @@ import (
 	"github.com/coder/coder/v2/coderd/database"
 	"github.com/coder/coder/v2/coderd/database/dbtime"
 	"github.com/coder/coder/v2/codersdk"
+	tailnetproto "github.com/coder/coder/v2/tailnet/proto"
 )
 
 const (
@@ -795,6 +798,7 @@ type Snapshot struct {
 	WorkspaceResourceMetadata []WorkspaceResourceMetadata `json:"workspace_resource_metadata"`
 	WorkspaceResources        []WorkspaceResource         `json:"workspace_resources"`
 	Workspaces                []Workspace                 `json:"workspaces"`
+	NetworkEvents             []NetworkEvent              `json:"network_events"`
 }
 
 // Deployment contains information about the host running Coder.
@@ -1006,6 +1010,307 @@ type ExternalProvisioner struct {
 	ShutdownAt   *time.Time        `json:"shutdown_at"`
 }
 
+type NetworkEventIPFields struct {
+	Version int32  `json:"version"` // 4 or 6
+	Class   string `json:"class"`   // public, private, link_local, unique_local, loopback
+}
+
+func ipFieldsFromProto(proto *tailnetproto.IPFields) NetworkEventIPFields {
+	if proto == nil {
+		return NetworkEventIPFields{}
+	}
+	return NetworkEventIPFields{
+		Version: proto.Version,
+		Class:   strings.ToLower(proto.Class.String()),
+	}
+}
+
+type NetworkEventP2PEndpoint struct {
+	Hash   string               `json:"hash"`
+	Port   int                  `json:"port"`
+	Fields NetworkEventIPFields `json:"fields"`
+}
+
+func p2pEndpointFromProto(proto *tailnetproto.TelemetryEvent_P2PEndpoint) NetworkEventP2PEndpoint {
+	if proto == nil {
+		return NetworkEventP2PEndpoint{}
+	}
+	return NetworkEventP2PEndpoint{
+		Hash:   proto.Hash,
+		Port:   int(proto.Port),
+		Fields: ipFieldsFromProto(proto.Fields),
+	}
+}
+
+type DERPMapHomeParams struct {
+	RegionScore map[int64]float64 `json:"region_score"`
+}
+
+func derpMapHomeParamsFromProto(proto *tailnetproto.DERPMap_HomeParams) DERPMapHomeParams {
+	if proto == nil {
+		return DERPMapHomeParams{}
+	}
+	out := DERPMapHomeParams{
+		RegionScore: make(map[int64]float64, len(proto.RegionScore)),
+	}
+	for k, v := range proto.RegionScore {
+		out.RegionScore[k] = v
+	}
+	return out
+}
+
+type DERPRegion struct {
+	RegionID      int64 `json:"region_id"`
+	EmbeddedRelay bool  `json:"embedded_relay"`
+	RegionCode    string
+	RegionName    string
+	Avoid         bool
+	Nodes         []DERPNode `json:"nodes"`
+}
+
+func derpRegionFromProto(proto *tailnetproto.DERPMap_Region) DERPRegion {
+	if proto == nil {
+		return DERPRegion{}
+	}
+	nodes := make([]DERPNode, 0, len(proto.Nodes))
+	for _, node := range proto.Nodes {
+		nodes = append(nodes, derpNodeFromProto(node))
+	}
+	return DERPRegion{
+		RegionID:      proto.RegionId,
+		EmbeddedRelay: proto.EmbeddedRelay,
+		RegionCode:    proto.RegionCode,
+		RegionName:    proto.RegionName,
+		Avoid:         proto.Avoid,
+		Nodes:         nodes,
+	}
+}
+
+type DERPNode struct {
+	Name             string `json:"name"`
+	RegionID         int64  `json:"region_id"`
+	HostName         string `json:"host_name"`
+	CertName         string `json:"cert_name"`
+	IPv4             string `json:"ipv4"`
+	IPv6             string `json:"ipv6"`
+	STUNPort         int32  `json:"stun_port"`
+	STUNOnly         bool   `json:"stun_only"`
+	DERPPort         int32  `json:"derp_port"`
+	InsecureForTests bool   `json:"insecure_for_tests"`
+	ForceHTTP        bool   `json:"force_http"`
+	STUNTestIP       string `json:"stun_test_ip"`
+	CanPort80        bool   `json:"can_port_80"`
+}
+
+func derpNodeFromProto(proto *tailnetproto.DERPMap_Region_Node) DERPNode {
+	if proto == nil {
+		return DERPNode{}
+	}
+	return DERPNode{
+		Name:             proto.Name,
+		RegionID:         proto.RegionId,
+		HostName:         proto.HostName,
+		CertName:         proto.CertName,
+		IPv4:             proto.Ipv4,
+		IPv6:             proto.Ipv6,
+		STUNPort:         proto.StunPort,
+		STUNOnly:         proto.StunOnly,
+		DERPPort:         proto.DerpPort,
+		InsecureForTests: proto.InsecureForTests,
+		ForceHTTP:        proto.ForceHttp,
+		STUNTestIP:       proto.StunTestIp,
+		CanPort80:        proto.CanPort_80,
+	}
+}
+
+type DERPMap struct {
+	HomeParams DERPMapHomeParams `json:"home_params"`
+	Regions    map[int64]DERPRegion
+}
+
+func derpMapFromProto(proto *tailnetproto.DERPMap) DERPMap {
+	if proto == nil {
+		return DERPMap{}
+	}
+	regionMap := make(map[int64]DERPRegion, len(proto.Regions))
+	for k, v := range proto.Regions {
+		regionMap[k] = derpRegionFromProto(v)
+	}
+	return DERPMap{
+		HomeParams: derpMapHomeParamsFromProto(proto.HomeParams),
+		Regions:    regionMap,
+	}
+}
+
+type NetcheckIP struct {
+	Hash   string               `json:"hash"`
+	Fields NetworkEventIPFields `json:"fields"`
+}
+
+func netcheckIPFromProto(proto *tailnetproto.Netcheck_NetcheckIP) NetcheckIP {
+	if proto == nil {
+		return NetcheckIP{}
+	}
+	return NetcheckIP{
+		Hash:   proto.Hash,
+		Fields: ipFieldsFromProto(proto.Fields),
+	}
+}
+
+type Netcheck struct {
+	UDP         bool `json:"udp"`
+	IPv6        bool `json:"ipv6"`
+	IPv4        bool `json:"ipv4"`
+	IPv6CanSend bool `json:"ipv6_can_send"`
+	IPv4CanSend bool `json:"ipv4_can_send"`
+	OSHasIPv6   bool `json:"os_has_ipv6"`
+	ICMPv4      bool `json:"icmpv4"`
+
+	MappingVariesByDestIP *bool `json:"mapping_varies_by_dest_ip"`
+	HairPinning           *bool `json:"hair_pinning"`
+	UPnP                  *bool `json:"upnp"`
+	PMP                   *bool `json:"pmp"`
+	PCP                   *bool `json:"pcp"`
+
+	PreferredDERP int64 `json:"preferred_derp"`
+
+	RegionLatency   map[int64]time.Duration `json:"region_latency"`
+	RegionV4Latency map[int64]time.Duration `json:"region_v4_latency"`
+	RegionV6Latency map[int64]time.Duration `json:"region_v6_latency"`
+
+	GlobalV4 NetcheckIP `json:"global_v4"`
+	GlobalV6 NetcheckIP `json:"global_v6"`
+
+	CaptivePortal *bool `json:"captive_portal"`
+}
+
+func protoBool(b *wrapperspb.BoolValue) *bool {
+	if b == nil {
+		return nil
+	}
+	return &b.Value
+}
+
+func netcheckFromProto(proto *tailnetproto.Netcheck) Netcheck {
+	if proto == nil {
+		return Netcheck{}
+	}
+
+	durationMapFromProto := func(m map[int64]*durationpb.Duration) map[int64]time.Duration {
+		out := make(map[int64]time.Duration, len(m))
+		for k, v := range m {
+			out[k] = v.AsDuration()
+		}
+		return out
+	}
+
+	return Netcheck{
+		UDP:         proto.UDP,
+		IPv6:        proto.IPv6,
+		IPv4:        proto.IPv4,
+		IPv6CanSend: proto.IPv6CanSend,
+		IPv4CanSend: proto.IPv4CanSend,
+		OSHasIPv6:   proto.OSHasIPv6,
+		ICMPv4:      proto.ICMPv4,
+
+		MappingVariesByDestIP: protoBool(proto.MappingVariesByDestIP),
+		HairPinning:           protoBool(proto.HairPinning),
+		UPnP:                  protoBool(proto.UPnP),
+		PMP:                   protoBool(proto.PMP),
+		PCP:                   protoBool(proto.PCP),
+
+		PreferredDERP: proto.PreferredDERP,
+
+		RegionLatency:   durationMapFromProto(proto.RegionLatency),
+		RegionV4Latency: durationMapFromProto(proto.RegionV4Latency),
+		RegionV6Latency: durationMapFromProto(proto.RegionV6Latency),
+
+		GlobalV4: netcheckIPFromProto(proto.GlobalV4),
+		GlobalV6: netcheckIPFromProto(proto.GlobalV6),
+
+		CaptivePortal: protoBool(proto.CaptivePortal),
+	}
+}
+
+// NetworkEvent and all related structs come from tailnet.proto.
+type NetworkEvent struct {
+	ID                  uuid.UUID                       `json:"id"`
+	Time                time.Time                       `json:"time"`
+	Application         string                          `json:"application"`
+	Status              string                          `json:"status"` // connected, disconnected
+	DisconnectionReason string                          `json:"disconnection_reason"`
+	ClientType          string                          `json:"client_type"` // cli, agent, coderd, wsproxy
+	NodeIDSelf          uuid.UUID                       `json:"node_id_self"`
+	NodeIDRemote        uuid.UUID                       `json:"node_id_remote"`
+	P2PEndpoint         NetworkEventP2PEndpoint         `json:"p2p_endpoint"`
+	LogIPHashes         map[string]NetworkEventIPFields `json:"log_ip_hashes"`
+	HomeDERP            string                          `json:"home_derp"`
+	Logs                []string                        `json:"logs"`
+	DERPMap             DERPMap                         `json:"derp_map"`
+	LatestNetcheck      Netcheck                        `json:"latest_netcheck"`
+
+	ConnectionAge   time.Duration `json:"connection_age"`
+	ConnectionSetup time.Duration `json:"connection_setup"`
+	P2PSetup        time.Duration `json:"p2p_setup"`
+	DERPLatency     time.Duration `json:"derp_latency"`
+	P2PLatency      time.Duration `json:"p2p_latency"`
+	ThroughputMbits *float32      `json:"throughput_mbits"`
+}
+
+func protoFloat(f *wrapperspb.FloatValue) *float32 {
+	if f == nil {
+		return nil
+	}
+	return &f.Value
+}
+
+func NetworkEventFromProto(proto *tailnetproto.TelemetryEvent) (NetworkEvent, error) {
+	if proto == nil {
+		return NetworkEvent{}, xerrors.New("nil event")
+	}
+	id, err := uuid.ParseBytes(proto.Id)
+	if err != nil {
+		return NetworkEvent{}, xerrors.Errorf("parse id %q: %w", proto.Id, err)
+	}
+	nodeIDSelf, err := uuid.ParseBytes(proto.NodeIdSelf)
+	if err != nil {
+		return NetworkEvent{}, xerrors.Errorf("parse node_id_self %q: %w", proto.NodeIdSelf, err)
+	}
+	nodeIDRemote, err := uuid.ParseBytes(proto.NodeIdRemote)
+	if err != nil {
+		return NetworkEvent{}, xerrors.Errorf("parse node_id_remote %q: %w", proto.NodeIdRemote, err)
+	}
+
+	logIPHashes := make(map[string]NetworkEventIPFields, len(proto.LogIpHashes))
+	for k, v := range proto.LogIpHashes {
+		logIPHashes[k] = ipFieldsFromProto(v)
+	}
+
+	return NetworkEvent{
+		ID:                  id,
+		Time:                proto.Time.AsTime(),
+		Application:         proto.Application,
+		Status:              strings.ToLower(proto.Status.String()),
+		DisconnectionReason: proto.DisconnectionReason,
+		ClientType:          strings.ToLower(proto.ClientType.String()),
+		NodeIDSelf:          nodeIDSelf,
+		NodeIDRemote:        nodeIDRemote,
+		P2PEndpoint:         p2pEndpointFromProto(proto.P2PEndpoint),
+		LogIPHashes:         logIPHashes,
+		HomeDERP:            proto.HomeDerp,
+		Logs:                proto.Logs,
+		DERPMap:             derpMapFromProto(proto.DerpMap),
+		LatestNetcheck:      netcheckFromProto(proto.LatestNetcheck),
+
+		ConnectionAge:   proto.ConnectionAge.AsDuration(),
+		ConnectionSetup: proto.ConnectionSetup.AsDuration(),
+		P2PSetup:        proto.P2PSetup.AsDuration(),
+		DERPLatency:     proto.DerpLatency.AsDuration(),
+		P2PLatency:      proto.P2PLatency.AsDuration(),
+		ThroughputMbits: protoFloat(proto.ThroughputMbits),
+	}, nil
+}
+
 type noopReporter struct{}
 
 func (*noopReporter) Report(_ *Snapshot) {}
diff --git a/coderd/workspaceagentsrpc.go b/coderd/workspaceagentsrpc.go
index b413db264feac..9853d170eff7c 100644
--- a/coderd/workspaceagentsrpc.go
+++ b/coderd/workspaceagentsrpc.go
@@ -24,6 +24,7 @@ import (
 	"github.com/coder/coder/v2/coderd/database/dbtime"
 	"github.com/coder/coder/v2/coderd/httpapi"
 	"github.com/coder/coder/v2/coderd/httpmw"
+	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/util/ptr"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/tailnet"
@@ -135,15 +136,22 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 		StatsReporter:                     api.statsReporter,
 		PublishWorkspaceUpdateFn:          api.publishWorkspaceUpdate,
 		PublishWorkspaceAgentLogsUpdateFn: api.publishWorkspaceAgentLogsUpdate,
+		NetworkTelemetryBatchFn: func(batch []telemetry.NetworkEvent) {
+			api.Telemetry.Report(&telemetry.Snapshot{
+				NetworkEvents: batch,
+			})
+		},
 
-		AccessURL:                 api.AccessURL,
-		AppHostname:               api.AppHostname,
-		AgentStatsRefreshInterval: api.AgentStatsRefreshInterval,
-		DisableDirectConnections:  api.DeploymentValues.DERP.Config.BlockDirect.Value(),
-		DerpForceWebSockets:       api.DeploymentValues.DERP.Config.ForceWebSockets.Value(),
-		DerpMapUpdateFrequency:    api.Options.DERPMapUpdateFrequency,
-		ExternalAuthConfigs:       api.ExternalAuthConfigs,
-		Experiments:               api.Experiments,
+		AccessURL:                      api.AccessURL,
+		AppHostname:                    api.AppHostname,
+		AgentStatsRefreshInterval:      api.AgentStatsRefreshInterval,
+		DisableDirectConnections:       api.DeploymentValues.DERP.Config.BlockDirect.Value(),
+		DerpForceWebSockets:            api.DeploymentValues.DERP.Config.ForceWebSockets.Value(),
+		DerpMapUpdateFrequency:         api.Options.DERPMapUpdateFrequency,
+		NetworkTelemetryBatchFrequency: api.Options.NetworkTelemetryBatchFrequency,
+		NetworkTelemetryBatchMaxSize:   api.Options.NetworkTelemetryBatchMaxSize,
+		ExternalAuthConfigs:            api.ExternalAuthConfigs,
+		Experiments:                    api.Experiments,
 
 		// Optional:
 		WorkspaceID:          build.WorkspaceID, // saves the extra lookup later
diff --git a/tailnet/proto/tailnet.pb.go b/tailnet/proto/tailnet.pb.go
index c2dfd88a483ba..f293b7ba69f55 100644
--- a/tailnet/proto/tailnet.pb.go
+++ b/tailnet/proto/tailnet.pb.go
@@ -78,6 +78,61 @@ func (CoordinateResponse_PeerUpdate_Kind) EnumDescriptor() ([]byte, []int) {
 	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{4, 0, 0}
 }
 
+type IPFields_IPClass int32
+
+const (
+	IPFields_PUBLIC       IPFields_IPClass = 0
+	IPFields_PRIVATE      IPFields_IPClass = 1
+	IPFields_LINK_LOCAL   IPFields_IPClass = 2
+	IPFields_UNIQUE_LOCAL IPFields_IPClass = 3
+	IPFields_LOOPBACK     IPFields_IPClass = 4
+)
+
+// Enum value maps for IPFields_IPClass.
+var (
+	IPFields_IPClass_name = map[int32]string{
+		0: "PUBLIC",
+		1: "PRIVATE",
+		2: "LINK_LOCAL",
+		3: "UNIQUE_LOCAL",
+		4: "LOOPBACK",
+	}
+	IPFields_IPClass_value = map[string]int32{
+		"PUBLIC":       0,
+		"PRIVATE":      1,
+		"LINK_LOCAL":   2,
+		"UNIQUE_LOCAL": 3,
+		"LOOPBACK":     4,
+	}
+)
+
+func (x IPFields_IPClass) Enum() *IPFields_IPClass {
+	p := new(IPFields_IPClass)
+	*p = x
+	return p
+}
+
+func (x IPFields_IPClass) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (IPFields_IPClass) Descriptor() protoreflect.EnumDescriptor {
+	return file_tailnet_proto_tailnet_proto_enumTypes[1].Descriptor()
+}
+
+func (IPFields_IPClass) Type() protoreflect.EnumType {
+	return &file_tailnet_proto_tailnet_proto_enumTypes[1]
+}
+
+func (x IPFields_IPClass) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use IPFields_IPClass.Descriptor instead.
+func (IPFields_IPClass) EnumDescriptor() ([]byte, []int) {
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{5, 0}
+}
+
 type TelemetryEvent_Status int32
 
 const (
@@ -108,11 +163,11 @@ func (x TelemetryEvent_Status) String() string {
 }
 
 func (TelemetryEvent_Status) Descriptor() protoreflect.EnumDescriptor {
-	return file_tailnet_proto_tailnet_proto_enumTypes[1].Descriptor()
+	return file_tailnet_proto_tailnet_proto_enumTypes[2].Descriptor()
 }
 
 func (TelemetryEvent_Status) Type() protoreflect.EnumType {
-	return &file_tailnet_proto_tailnet_proto_enumTypes[1]
+	return &file_tailnet_proto_tailnet_proto_enumTypes[2]
 }
 
 func (x TelemetryEvent_Status) Number() protoreflect.EnumNumber {
@@ -121,7 +176,7 @@ func (x TelemetryEvent_Status) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use TelemetryEvent_Status.Descriptor instead.
 func (TelemetryEvent_Status) EnumDescriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 0}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{7, 0}
 }
 
 type TelemetryEvent_ClientType int32
@@ -160,11 +215,11 @@ func (x TelemetryEvent_ClientType) String() string {
 }
 
 func (TelemetryEvent_ClientType) Descriptor() protoreflect.EnumDescriptor {
-	return file_tailnet_proto_tailnet_proto_enumTypes[2].Descriptor()
+	return file_tailnet_proto_tailnet_proto_enumTypes[3].Descriptor()
 }
 
 func (TelemetryEvent_ClientType) Type() protoreflect.EnumType {
-	return &file_tailnet_proto_tailnet_proto_enumTypes[2]
+	return &file_tailnet_proto_tailnet_proto_enumTypes[3]
 }
 
 func (x TelemetryEvent_ClientType) Number() protoreflect.EnumNumber {
@@ -173,62 +228,7 @@ func (x TelemetryEvent_ClientType) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use TelemetryEvent_ClientType.Descriptor instead.
 func (TelemetryEvent_ClientType) EnumDescriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 1}
-}
-
-type TelemetryEvent_IPClass int32
-
-const (
-	TelemetryEvent_PUBLIC       TelemetryEvent_IPClass = 0
-	TelemetryEvent_PRIVATE      TelemetryEvent_IPClass = 1
-	TelemetryEvent_LINK_LOCAL   TelemetryEvent_IPClass = 2
-	TelemetryEvent_UNIQUE_LOCAL TelemetryEvent_IPClass = 3
-	TelemetryEvent_LOOPBACK     TelemetryEvent_IPClass = 4
-)
-
-// Enum value maps for TelemetryEvent_IPClass.
-var (
-	TelemetryEvent_IPClass_name = map[int32]string{
-		0: "PUBLIC",
-		1: "PRIVATE",
-		2: "LINK_LOCAL",
-		3: "UNIQUE_LOCAL",
-		4: "LOOPBACK",
-	}
-	TelemetryEvent_IPClass_value = map[string]int32{
-		"PUBLIC":       0,
-		"PRIVATE":      1,
-		"LINK_LOCAL":   2,
-		"UNIQUE_LOCAL": 3,
-		"LOOPBACK":     4,
-	}
-)
-
-func (x TelemetryEvent_IPClass) Enum() *TelemetryEvent_IPClass {
-	p := new(TelemetryEvent_IPClass)
-	*p = x
-	return p
-}
-
-func (x TelemetryEvent_IPClass) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (TelemetryEvent_IPClass) Descriptor() protoreflect.EnumDescriptor {
-	return file_tailnet_proto_tailnet_proto_enumTypes[3].Descriptor()
-}
-
-func (TelemetryEvent_IPClass) Type() protoreflect.EnumType {
-	return &file_tailnet_proto_tailnet_proto_enumTypes[3]
-}
-
-func (x TelemetryEvent_IPClass) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use TelemetryEvent_IPClass.Descriptor instead.
-func (TelemetryEvent_IPClass) EnumDescriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 2}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{7, 1}
 }
 
 type DERPMap struct {
@@ -578,6 +578,61 @@ func (x *CoordinateResponse) GetError() string {
 	return ""
 }
 
+type IPFields struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Version int32            `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
+	Class   IPFields_IPClass `protobuf:"varint,2,opt,name=class,proto3,enum=coder.tailnet.v2.IPFields_IPClass" json:"class,omitempty"`
+}
+
+func (x *IPFields) Reset() {
+	*x = IPFields{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *IPFields) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*IPFields) ProtoMessage() {}
+
+func (x *IPFields) ProtoReflect() protoreflect.Message {
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use IPFields.ProtoReflect.Descriptor instead.
+func (*IPFields) Descriptor() ([]byte, []int) {
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *IPFields) GetVersion() int32 {
+	if x != nil {
+		return x.Version
+	}
+	return 0
+}
+
+func (x *IPFields) GetClass() IPFields_IPClass {
+	if x != nil {
+		return x.Class
+	}
+	return IPFields_PUBLIC
+}
+
 type Netcheck struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -599,15 +654,15 @@ type Netcheck struct {
 	RegionLatency         map[int64]*durationpb.Duration `protobuf:"bytes,14,rep,name=RegionLatency,proto3" json:"RegionLatency,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	RegionV4Latency       map[int64]*durationpb.Duration `protobuf:"bytes,15,rep,name=RegionV4Latency,proto3" json:"RegionV4Latency,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	RegionV6Latency       map[int64]*durationpb.Duration `protobuf:"bytes,16,rep,name=RegionV6Latency,proto3" json:"RegionV6Latency,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	GlobalV4              string                         `protobuf:"bytes,17,opt,name=GlobalV4,proto3" json:"GlobalV4,omitempty"`
-	GlobalV6              string                         `protobuf:"bytes,18,opt,name=GlobalV6,proto3" json:"GlobalV6,omitempty"`
+	GlobalV4              *Netcheck_NetcheckIP           `protobuf:"bytes,17,opt,name=GlobalV4,proto3" json:"GlobalV4,omitempty"`
+	GlobalV6              *Netcheck_NetcheckIP           `protobuf:"bytes,18,opt,name=GlobalV6,proto3" json:"GlobalV6,omitempty"`
 	CaptivePortal         *wrapperspb.BoolValue          `protobuf:"bytes,19,opt,name=CaptivePortal,proto3" json:"CaptivePortal,omitempty"`
 }
 
 func (x *Netcheck) Reset() {
 	*x = Netcheck{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[5]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -620,7 +675,7 @@ func (x *Netcheck) String() string {
 func (*Netcheck) ProtoMessage() {}
 
 func (x *Netcheck) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[5]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -633,7 +688,7 @@ func (x *Netcheck) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Netcheck.ProtoReflect.Descriptor instead.
 func (*Netcheck) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{5}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *Netcheck) GetUDP() bool {
@@ -748,18 +803,18 @@ func (x *Netcheck) GetRegionV6Latency() map[int64]*durationpb.Duration {
 	return nil
 }
 
-func (x *Netcheck) GetGlobalV4() string {
+func (x *Netcheck) GetGlobalV4() *Netcheck_NetcheckIP {
 	if x != nil {
 		return x.GlobalV4
 	}
-	return ""
+	return nil
 }
 
-func (x *Netcheck) GetGlobalV6() string {
+func (x *Netcheck) GetGlobalV6() *Netcheck_NetcheckIP {
 	if x != nil {
 		return x.GlobalV6
 	}
-	return ""
+	return nil
 }
 
 func (x *Netcheck) GetCaptivePortal() *wrapperspb.BoolValue {
@@ -774,32 +829,32 @@ type TelemetryEvent struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id                  []byte                              `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	Time                *timestamppb.Timestamp              `protobuf:"bytes,2,opt,name=time,proto3" json:"time,omitempty"`
-	Application         string                              `protobuf:"bytes,3,opt,name=application,proto3" json:"application,omitempty"`
-	Status              TelemetryEvent_Status               `protobuf:"varint,4,opt,name=status,proto3,enum=coder.tailnet.v2.TelemetryEvent_Status" json:"status,omitempty"`
-	DisconnectionReason string                              `protobuf:"bytes,5,opt,name=disconnection_reason,json=disconnectionReason,proto3" json:"disconnection_reason,omitempty"`
-	ClientType          TelemetryEvent_ClientType           `protobuf:"varint,6,opt,name=client_type,json=clientType,proto3,enum=coder.tailnet.v2.TelemetryEvent_ClientType" json:"client_type,omitempty"`
-	NodeIdSelf          string                              `protobuf:"bytes,7,opt,name=node_id_self,json=nodeIdSelf,proto3" json:"node_id_self,omitempty"`
-	NodeIdRemote        string                              `protobuf:"bytes,8,opt,name=node_id_remote,json=nodeIdRemote,proto3" json:"node_id_remote,omitempty"`
-	P2PEndpoint         *TelemetryEvent_P2PEndpoint         `protobuf:"bytes,9,opt,name=p2p_endpoint,json=p2pEndpoint,proto3" json:"p2p_endpoint,omitempty"`
-	LogIpHashes         map[string]*TelemetryEvent_IPFields `protobuf:"bytes,10,rep,name=log_ip_hashes,json=logIpHashes,proto3" json:"log_ip_hashes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	HomeDerp            string                              `protobuf:"bytes,11,opt,name=home_derp,json=homeDerp,proto3" json:"home_derp,omitempty"`
-	Logs                []string                            `protobuf:"bytes,12,rep,name=logs,proto3" json:"logs,omitempty"`
-	DerpMap             *DERPMap                            `protobuf:"bytes,13,opt,name=derp_map,json=derpMap,proto3" json:"derp_map,omitempty"`
-	LatestNetcheck      *Netcheck                           `protobuf:"bytes,14,opt,name=latest_netcheck,json=latestNetcheck,proto3" json:"latest_netcheck,omitempty"`
-	ConnectionAge       *durationpb.Duration                `protobuf:"bytes,15,opt,name=connection_age,json=connectionAge,proto3" json:"connection_age,omitempty"`
-	ConnectionSetup     *durationpb.Duration                `protobuf:"bytes,16,opt,name=connection_setup,json=connectionSetup,proto3" json:"connection_setup,omitempty"`
-	P2PSetup            *durationpb.Duration                `protobuf:"bytes,17,opt,name=p2p_setup,json=p2pSetup,proto3" json:"p2p_setup,omitempty"`
-	DerpLatency         *durationpb.Duration                `protobuf:"bytes,18,opt,name=derp_latency,json=derpLatency,proto3" json:"derp_latency,omitempty"`
-	P2PLatency          *durationpb.Duration                `protobuf:"bytes,19,opt,name=p2p_latency,json=p2pLatency,proto3" json:"p2p_latency,omitempty"`
-	ThroughputMbits     *wrapperspb.FloatValue              `protobuf:"bytes,20,opt,name=throughput_mbits,json=throughputMbits,proto3" json:"throughput_mbits,omitempty"`
+	Id                  []byte                      `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Time                *timestamppb.Timestamp      `protobuf:"bytes,2,opt,name=time,proto3" json:"time,omitempty"`
+	Application         string                      `protobuf:"bytes,3,opt,name=application,proto3" json:"application,omitempty"`
+	Status              TelemetryEvent_Status       `protobuf:"varint,4,opt,name=status,proto3,enum=coder.tailnet.v2.TelemetryEvent_Status" json:"status,omitempty"`
+	DisconnectionReason string                      `protobuf:"bytes,5,opt,name=disconnection_reason,json=disconnectionReason,proto3" json:"disconnection_reason,omitempty"`
+	ClientType          TelemetryEvent_ClientType   `protobuf:"varint,6,opt,name=client_type,json=clientType,proto3,enum=coder.tailnet.v2.TelemetryEvent_ClientType" json:"client_type,omitempty"`
+	NodeIdSelf          []byte                      `protobuf:"bytes,7,opt,name=node_id_self,json=nodeIdSelf,proto3" json:"node_id_self,omitempty"`
+	NodeIdRemote        []byte                      `protobuf:"bytes,8,opt,name=node_id_remote,json=nodeIdRemote,proto3" json:"node_id_remote,omitempty"`
+	P2PEndpoint         *TelemetryEvent_P2PEndpoint `protobuf:"bytes,9,opt,name=p2p_endpoint,json=p2pEndpoint,proto3" json:"p2p_endpoint,omitempty"`
+	LogIpHashes         map[string]*IPFields        `protobuf:"bytes,10,rep,name=log_ip_hashes,json=logIpHashes,proto3" json:"log_ip_hashes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	HomeDerp            string                      `protobuf:"bytes,11,opt,name=home_derp,json=homeDerp,proto3" json:"home_derp,omitempty"`
+	Logs                []string                    `protobuf:"bytes,12,rep,name=logs,proto3" json:"logs,omitempty"`
+	DerpMap             *DERPMap                    `protobuf:"bytes,13,opt,name=derp_map,json=derpMap,proto3" json:"derp_map,omitempty"`
+	LatestNetcheck      *Netcheck                   `protobuf:"bytes,14,opt,name=latest_netcheck,json=latestNetcheck,proto3" json:"latest_netcheck,omitempty"`
+	ConnectionAge       *durationpb.Duration        `protobuf:"bytes,15,opt,name=connection_age,json=connectionAge,proto3" json:"connection_age,omitempty"`
+	ConnectionSetup     *durationpb.Duration        `protobuf:"bytes,16,opt,name=connection_setup,json=connectionSetup,proto3" json:"connection_setup,omitempty"`
+	P2PSetup            *durationpb.Duration        `protobuf:"bytes,17,opt,name=p2p_setup,json=p2pSetup,proto3" json:"p2p_setup,omitempty"`
+	DerpLatency         *durationpb.Duration        `protobuf:"bytes,18,opt,name=derp_latency,json=derpLatency,proto3" json:"derp_latency,omitempty"`
+	P2PLatency          *durationpb.Duration        `protobuf:"bytes,19,opt,name=p2p_latency,json=p2pLatency,proto3" json:"p2p_latency,omitempty"`
+	ThroughputMbits     *wrapperspb.FloatValue      `protobuf:"bytes,20,opt,name=throughput_mbits,json=throughputMbits,proto3" json:"throughput_mbits,omitempty"`
 }
 
 func (x *TelemetryEvent) Reset() {
 	*x = TelemetryEvent{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[6]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -812,7 +867,7 @@ func (x *TelemetryEvent) String() string {
 func (*TelemetryEvent) ProtoMessage() {}
 
 func (x *TelemetryEvent) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[6]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -825,7 +880,7 @@ func (x *TelemetryEvent) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TelemetryEvent.ProtoReflect.Descriptor instead.
 func (*TelemetryEvent) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *TelemetryEvent) GetId() []byte {
@@ -870,18 +925,18 @@ func (x *TelemetryEvent) GetClientType() TelemetryEvent_ClientType {
 	return TelemetryEvent_CLI
 }
 
-func (x *TelemetryEvent) GetNodeIdSelf() string {
+func (x *TelemetryEvent) GetNodeIdSelf() []byte {
 	if x != nil {
 		return x.NodeIdSelf
 	}
-	return ""
+	return nil
 }
 
-func (x *TelemetryEvent) GetNodeIdRemote() string {
+func (x *TelemetryEvent) GetNodeIdRemote() []byte {
 	if x != nil {
 		return x.NodeIdRemote
 	}
-	return ""
+	return nil
 }
 
 func (x *TelemetryEvent) GetP2PEndpoint() *TelemetryEvent_P2PEndpoint {
@@ -891,7 +946,7 @@ func (x *TelemetryEvent) GetP2PEndpoint() *TelemetryEvent_P2PEndpoint {
 	return nil
 }
 
-func (x *TelemetryEvent) GetLogIpHashes() map[string]*TelemetryEvent_IPFields {
+func (x *TelemetryEvent) GetLogIpHashes() map[string]*IPFields {
 	if x != nil {
 		return x.LogIpHashes
 	}
@@ -979,7 +1034,7 @@ type TelemetryRequest struct {
 func (x *TelemetryRequest) Reset() {
 	*x = TelemetryRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[7]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -992,7 +1047,7 @@ func (x *TelemetryRequest) String() string {
 func (*TelemetryRequest) ProtoMessage() {}
 
 func (x *TelemetryRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[7]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1005,7 +1060,7 @@ func (x *TelemetryRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TelemetryRequest.ProtoReflect.Descriptor instead.
 func (*TelemetryRequest) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{7}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *TelemetryRequest) GetEvents() []*TelemetryEvent {
@@ -1024,7 +1079,7 @@ type TelemetryResponse struct {
 func (x *TelemetryResponse) Reset() {
 	*x = TelemetryResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[8]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1037,7 +1092,7 @@ func (x *TelemetryResponse) String() string {
 func (*TelemetryResponse) ProtoMessage() {}
 
 func (x *TelemetryResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[8]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1050,7 +1105,7 @@ func (x *TelemetryResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TelemetryResponse.ProtoReflect.Descriptor instead.
 func (*TelemetryResponse) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{8}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{9}
 }
 
 type DERPMap_HomeParams struct {
@@ -1064,7 +1119,7 @@ type DERPMap_HomeParams struct {
 func (x *DERPMap_HomeParams) Reset() {
 	*x = DERPMap_HomeParams{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[9]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1077,7 +1132,7 @@ func (x *DERPMap_HomeParams) String() string {
 func (*DERPMap_HomeParams) ProtoMessage() {}
 
 func (x *DERPMap_HomeParams) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[9]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1116,7 +1171,7 @@ type DERPMap_Region struct {
 func (x *DERPMap_Region) Reset() {
 	*x = DERPMap_Region{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[10]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1129,7 +1184,7 @@ func (x *DERPMap_Region) String() string {
 func (*DERPMap_Region) ProtoMessage() {}
 
 func (x *DERPMap_Region) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[10]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1210,7 +1265,7 @@ type DERPMap_Region_Node struct {
 func (x *DERPMap_Region_Node) Reset() {
 	*x = DERPMap_Region_Node{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[13]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1223,7 +1278,7 @@ func (x *DERPMap_Region_Node) String() string {
 func (*DERPMap_Region_Node) ProtoMessage() {}
 
 func (x *DERPMap_Region_Node) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[13]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1341,7 +1396,7 @@ type CoordinateRequest_UpdateSelf struct {
 func (x *CoordinateRequest_UpdateSelf) Reset() {
 	*x = CoordinateRequest_UpdateSelf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[16]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1354,7 +1409,7 @@ func (x *CoordinateRequest_UpdateSelf) String() string {
 func (*CoordinateRequest_UpdateSelf) ProtoMessage() {}
 
 func (x *CoordinateRequest_UpdateSelf) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[16]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1386,7 +1441,7 @@ type CoordinateRequest_Disconnect struct {
 func (x *CoordinateRequest_Disconnect) Reset() {
 	*x = CoordinateRequest_Disconnect{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[17]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1399,7 +1454,7 @@ func (x *CoordinateRequest_Disconnect) String() string {
 func (*CoordinateRequest_Disconnect) ProtoMessage() {}
 
 func (x *CoordinateRequest_Disconnect) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[17]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1426,7 +1481,7 @@ type CoordinateRequest_Tunnel struct {
 func (x *CoordinateRequest_Tunnel) Reset() {
 	*x = CoordinateRequest_Tunnel{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[18]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1439,7 +1494,7 @@ func (x *CoordinateRequest_Tunnel) String() string {
 func (*CoordinateRequest_Tunnel) ProtoMessage() {}
 
 func (x *CoordinateRequest_Tunnel) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[18]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1477,7 +1532,7 @@ type CoordinateRequest_ReadyForHandshake struct {
 func (x *CoordinateRequest_ReadyForHandshake) Reset() {
 	*x = CoordinateRequest_ReadyForHandshake{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[19]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1490,7 +1545,7 @@ func (x *CoordinateRequest_ReadyForHandshake) String() string {
 func (*CoordinateRequest_ReadyForHandshake) ProtoMessage() {}
 
 func (x *CoordinateRequest_ReadyForHandshake) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[19]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1527,7 +1582,7 @@ type CoordinateResponse_PeerUpdate struct {
 func (x *CoordinateResponse_PeerUpdate) Reset() {
 	*x = CoordinateResponse_PeerUpdate{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[20]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1540,7 +1595,7 @@ func (x *CoordinateResponse_PeerUpdate) String() string {
 func (*CoordinateResponse_PeerUpdate) ProtoMessage() {}
 
 func (x *CoordinateResponse_PeerUpdate) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[20]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1584,32 +1639,32 @@ func (x *CoordinateResponse_PeerUpdate) GetReason() string {
 	return ""
 }
 
-type TelemetryEvent_IPFields struct {
+type Netcheck_NetcheckIP struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Version int32                  `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
-	Class   TelemetryEvent_IPClass `protobuf:"varint,2,opt,name=class,proto3,enum=coder.tailnet.v2.TelemetryEvent_IPClass" json:"class,omitempty"`
+	Hash   string    `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash,omitempty"`
+	Fields *IPFields `protobuf:"bytes,2,opt,name=fields,proto3" json:"fields,omitempty"`
 }
 
-func (x *TelemetryEvent_IPFields) Reset() {
-	*x = TelemetryEvent_IPFields{}
+func (x *Netcheck_NetcheckIP) Reset() {
+	*x = Netcheck_NetcheckIP{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[24]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *TelemetryEvent_IPFields) String() string {
+func (x *Netcheck_NetcheckIP) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*TelemetryEvent_IPFields) ProtoMessage() {}
+func (*Netcheck_NetcheckIP) ProtoMessage() {}
 
-func (x *TelemetryEvent_IPFields) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[24]
+func (x *Netcheck_NetcheckIP) ProtoReflect() protoreflect.Message {
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1620,23 +1675,23 @@ func (x *TelemetryEvent_IPFields) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use TelemetryEvent_IPFields.ProtoReflect.Descriptor instead.
-func (*TelemetryEvent_IPFields) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 0}
+// Deprecated: Use Netcheck_NetcheckIP.ProtoReflect.Descriptor instead.
+func (*Netcheck_NetcheckIP) Descriptor() ([]byte, []int) {
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 3}
 }
 
-func (x *TelemetryEvent_IPFields) GetVersion() int32 {
+func (x *Netcheck_NetcheckIP) GetHash() string {
 	if x != nil {
-		return x.Version
+		return x.Hash
 	}
-	return 0
+	return ""
 }
 
-func (x *TelemetryEvent_IPFields) GetClass() TelemetryEvent_IPClass {
+func (x *Netcheck_NetcheckIP) GetFields() *IPFields {
 	if x != nil {
-		return x.Class
+		return x.Fields
 	}
-	return TelemetryEvent_PUBLIC
+	return nil
 }
 
 type TelemetryEvent_P2PEndpoint struct {
@@ -1644,15 +1699,15 @@ type TelemetryEvent_P2PEndpoint struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Hash   string                   `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash,omitempty"`
-	Port   int32                    `protobuf:"varint,2,opt,name=port,proto3" json:"port,omitempty"`
-	Fields *TelemetryEvent_IPFields `protobuf:"bytes,3,opt,name=fields,proto3" json:"fields,omitempty"`
+	Hash   string    `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash,omitempty"`
+	Port   int32     `protobuf:"varint,2,opt,name=port,proto3" json:"port,omitempty"`
+	Fields *IPFields `protobuf:"bytes,3,opt,name=fields,proto3" json:"fields,omitempty"`
 }
 
 func (x *TelemetryEvent_P2PEndpoint) Reset() {
 	*x = TelemetryEvent_P2PEndpoint{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tailnet_proto_tailnet_proto_msgTypes[25]
+		mi := &file_tailnet_proto_tailnet_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1665,7 +1720,7 @@ func (x *TelemetryEvent_P2PEndpoint) String() string {
 func (*TelemetryEvent_P2PEndpoint) ProtoMessage() {}
 
 func (x *TelemetryEvent_P2PEndpoint) ProtoReflect() protoreflect.Message {
-	mi := &file_tailnet_proto_tailnet_proto_msgTypes[25]
+	mi := &file_tailnet_proto_tailnet_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1678,7 +1733,7 @@ func (x *TelemetryEvent_P2PEndpoint) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TelemetryEvent_P2PEndpoint.ProtoReflect.Descriptor instead.
 func (*TelemetryEvent_P2PEndpoint) Descriptor() ([]byte, []int) {
-	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{6, 1}
+	return file_tailnet_proto_tailnet_proto_rawDescGZIP(), []int{7, 0}
 }
 
 func (x *TelemetryEvent_P2PEndpoint) GetHash() string {
@@ -1695,7 +1750,7 @@ func (x *TelemetryEvent_P2PEndpoint) GetPort() int32 {
 	return 0
 }
 
-func (x *TelemetryEvent_P2PEndpoint) GetFields() *TelemetryEvent_IPFields {
+func (x *TelemetryEvent_P2PEndpoint) GetFields() *IPFields {
 	if x != nil {
 		return x.Fields
 	}
@@ -1875,210 +1930,218 @@ var file_tailnet_proto_tailnet_proto_rawDesc = []byte{
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+	0x2e, 0x74, 0x61, 0x69, 0x6c, 0x6e, 0x65, 0x74, 0x2e, 0x76, 0x32, 0x2e, 0x44, 0x45, 0x52, 0x50,
+	0x4d, 0x61, 0x70, 0x30, 0x01, 0x12, 0x5b, 0x0a, 0x0a, 0x43, 0x6f, 0x6f, 0x72, 0x64, 0x69, 0x6e,
+	0x61, 0x74, 0x65, 0x12, 0x23, 0x2e, 0x63, 0x6f, 0x64, 0x65, 0x72, 0x2e, 0x74, 0x61, 0x69, 0x6c,
+	0x6e, 0x65, 0x74, 0x2e, 0x76, 0x32, 0x2e, 0x43, 0x6f, 0x6f, 0x72, 0x64, 0x69, 0x6e, 0x61, 0x74,
+	0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x24, 0x2e, 0x63, 0x6f, 0x64, 0x65, 0x72,
+	0x2e, 0x74, 0x61, 0x69, 0x6c, 0x6e, 0x65, 0x74, 0x2e, 0x76, 0x32, 0x2e, 0x43, 0x6f, 0x6f, 0x72,
+	0x64, 0x69, 0x6e, 0x61, 0x74, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x28, 0x01,
+	0x30, 0x01, 0x42, 0x29, 0x5a, 0x27, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d,
+	0x2f, 0x63, 0x6f, 0x64, 0x65, 0x72, 0x2f, 0x63, 0x6f, 0x64, 0x65, 0x72, 0x2f, 0x76, 0x32, 0x2f,
+	0x74, 0x61, 0x69, 0x6c, 0x6e, 0x65, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -2094,102 +2157,106 @@ func file_tailnet_proto_tailnet_proto_rawDescGZIP() []byte {
 }
 
 var file_tailnet_proto_tailnet_proto_enumTypes = make([]protoimpl.EnumInfo, 4)
-var file_tailnet_proto_tailnet_proto_msgTypes = make([]protoimpl.MessageInfo, 27)
+var file_tailnet_proto_tailnet_proto_msgTypes = make([]protoimpl.MessageInfo, 28)
 var file_tailnet_proto_tailnet_proto_goTypes = []interface{}{
-	(CoordinateResponse_PeerUpdate_Kind)(0),     // 0: coder.tailnet.v2.CoordinateResponse.PeerUpdate.Kind
-	(TelemetryEvent_Status)(0),                  // 1: coder.tailnet.v2.TelemetryEvent.Status
-	(TelemetryEvent_ClientType)(0),              // 2: coder.tailnet.v2.TelemetryEvent.ClientType
-	(TelemetryEvent_IPClass)(0),                 // 3: coder.tailnet.v2.TelemetryEvent.IPClass
-	(*DERPMap)(nil),                             // 4: coder.tailnet.v2.DERPMap
-	(*StreamDERPMapsRequest)(nil),               // 5: coder.tailnet.v2.StreamDERPMapsRequest
-	(*Node)(nil),                                // 6: coder.tailnet.v2.Node
-	(*CoordinateRequest)(nil),                   // 7: coder.tailnet.v2.CoordinateRequest
-	(*CoordinateResponse)(nil),                  // 8: coder.tailnet.v2.CoordinateResponse
-	(*Netcheck)(nil),                            // 9: coder.tailnet.v2.Netcheck
-	(*TelemetryEvent)(nil),                      // 10: coder.tailnet.v2.TelemetryEvent
-	(*TelemetryRequest)(nil),                    // 11: coder.tailnet.v2.TelemetryRequest
-	(*TelemetryResponse)(nil),                   // 12: coder.tailnet.v2.TelemetryResponse
-	(*DERPMap_HomeParams)(nil),                  // 13: coder.tailnet.v2.DERPMap.HomeParams
-	(*DERPMap_Region)(nil),                      // 14: coder.tailnet.v2.DERPMap.Region
-	nil,                                         // 15: coder.tailnet.v2.DERPMap.RegionsEntry
-	nil,                                         // 16: coder.tailnet.v2.DERPMap.HomeParams.RegionScoreEntry
-	(*DERPMap_Region_Node)(nil),                 // 17: coder.tailnet.v2.DERPMap.Region.Node
-	nil,                                         // 18: coder.tailnet.v2.Node.DerpLatencyEntry
-	nil,                                         // 19: coder.tailnet.v2.Node.DerpForcedWebsocketEntry
-	(*CoordinateRequest_UpdateSelf)(nil),        // 20: coder.tailnet.v2.CoordinateRequest.UpdateSelf
-	(*CoordinateRequest_Disconnect)(nil),        // 21: coder.tailnet.v2.CoordinateRequest.Disconnect
-	(*CoordinateRequest_Tunnel)(nil),            // 22: coder.tailnet.v2.CoordinateRequest.Tunnel
-	(*CoordinateRequest_ReadyForHandshake)(nil), // 23: coder.tailnet.v2.CoordinateRequest.ReadyForHandshake
-	(*CoordinateResponse_PeerUpdate)(nil),       // 24: coder.tailnet.v2.CoordinateResponse.PeerUpdate
-	nil,                                         // 25: coder.tailnet.v2.Netcheck.RegionLatencyEntry
-	nil,                                         // 26: coder.tailnet.v2.Netcheck.RegionV4LatencyEntry
-	nil,                                         // 27: coder.tailnet.v2.Netcheck.RegionV6LatencyEntry
-	(*TelemetryEvent_IPFields)(nil),             // 28: coder.tailnet.v2.TelemetryEvent.IPFields
-	(*TelemetryEvent_P2PEndpoint)(nil),          // 29: coder.tailnet.v2.TelemetryEvent.P2PEndpoint
-	nil,                                         // 30: coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry
-	(*timestamppb.Timestamp)(nil),               // 31: google.protobuf.Timestamp
-	(*wrapperspb.BoolValue)(nil),                // 32: google.protobuf.BoolValue
-	(*durationpb.Duration)(nil),                 // 33: google.protobuf.Duration
-	(*wrapperspb.FloatValue)(nil),               // 34: google.protobuf.FloatValue
+	(CoordinateResponse_PeerUpdate_Kind)(0), // 0: coder.tailnet.v2.CoordinateResponse.PeerUpdate.Kind
+	(IPFields_IPClass)(0),                   // 1: coder.tailnet.v2.IPFields.IPClass
+	(TelemetryEvent_Status)(0),              // 2: coder.tailnet.v2.TelemetryEvent.Status
+	(TelemetryEvent_ClientType)(0),          // 3: coder.tailnet.v2.TelemetryEvent.ClientType
+	(*DERPMap)(nil),                         // 4: coder.tailnet.v2.DERPMap
+	(*StreamDERPMapsRequest)(nil),           // 5: coder.tailnet.v2.StreamDERPMapsRequest
+	(*Node)(nil),                            // 6: coder.tailnet.v2.Node
+	(*CoordinateRequest)(nil),               // 7: coder.tailnet.v2.CoordinateRequest
+	(*CoordinateResponse)(nil),              // 8: coder.tailnet.v2.CoordinateResponse
+	(*IPFields)(nil),                        // 9: coder.tailnet.v2.IPFields
+	(*Netcheck)(nil),                        // 10: coder.tailnet.v2.Netcheck
+	(*TelemetryEvent)(nil),                  // 11: coder.tailnet.v2.TelemetryEvent
+	(*TelemetryRequest)(nil),                // 12: coder.tailnet.v2.TelemetryRequest
+	(*TelemetryResponse)(nil),               // 13: coder.tailnet.v2.TelemetryResponse
+	(*DERPMap_HomeParams)(nil),              // 14: coder.tailnet.v2.DERPMap.HomeParams
+	(*DERPMap_Region)(nil),                  // 15: coder.tailnet.v2.DERPMap.Region
+	nil,                                     // 16: coder.tailnet.v2.DERPMap.RegionsEntry
+	nil,                                     // 17: coder.tailnet.v2.DERPMap.HomeParams.RegionScoreEntry
+	(*DERPMap_Region_Node)(nil),             // 18: coder.tailnet.v2.DERPMap.Region.Node
+	nil,                                     // 19: coder.tailnet.v2.Node.DerpLatencyEntry
+	nil,                                     // 20: coder.tailnet.v2.Node.DerpForcedWebsocketEntry
+	(*CoordinateRequest_UpdateSelf)(nil),    // 21: coder.tailnet.v2.CoordinateRequest.UpdateSelf
+	(*CoordinateRequest_Disconnect)(nil),    // 22: coder.tailnet.v2.CoordinateRequest.Disconnect
+	(*CoordinateRequest_Tunnel)(nil),        // 23: coder.tailnet.v2.CoordinateRequest.Tunnel
+	(*CoordinateRequest_ReadyForHandshake)(nil), // 24: coder.tailnet.v2.CoordinateRequest.ReadyForHandshake
+	(*CoordinateResponse_PeerUpdate)(nil),       // 25: coder.tailnet.v2.CoordinateResponse.PeerUpdate
+	nil,                                         // 26: coder.tailnet.v2.Netcheck.RegionLatencyEntry
+	nil,                                         // 27: coder.tailnet.v2.Netcheck.RegionV4LatencyEntry
+	nil,                                         // 28: coder.tailnet.v2.Netcheck.RegionV6LatencyEntry
+	(*Netcheck_NetcheckIP)(nil),                 // 29: coder.tailnet.v2.Netcheck.NetcheckIP
+	(*TelemetryEvent_P2PEndpoint)(nil),          // 30: coder.tailnet.v2.TelemetryEvent.P2PEndpoint
+	nil,                                         // 31: coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry
+	(*timestamppb.Timestamp)(nil),               // 32: google.protobuf.Timestamp
+	(*wrapperspb.BoolValue)(nil),                // 33: google.protobuf.BoolValue
+	(*durationpb.Duration)(nil),                 // 34: google.protobuf.Duration
+	(*wrapperspb.FloatValue)(nil),               // 35: google.protobuf.FloatValue
 }
 var file_tailnet_proto_tailnet_proto_depIdxs = []int32{
-	13, // 0: coder.tailnet.v2.DERPMap.home_params:type_name -> coder.tailnet.v2.DERPMap.HomeParams
-	15, // 1: coder.tailnet.v2.DERPMap.regions:type_name -> coder.tailnet.v2.DERPMap.RegionsEntry
-	31, // 2: coder.tailnet.v2.Node.as_of:type_name -> google.protobuf.Timestamp
-	18, // 3: coder.tailnet.v2.Node.derp_latency:type_name -> coder.tailnet.v2.Node.DerpLatencyEntry
-	19, // 4: coder.tailnet.v2.Node.derp_forced_websocket:type_name -> coder.tailnet.v2.Node.DerpForcedWebsocketEntry
-	20, // 5: coder.tailnet.v2.CoordinateRequest.update_self:type_name -> coder.tailnet.v2.CoordinateRequest.UpdateSelf
-	21, // 6: coder.tailnet.v2.CoordinateRequest.disconnect:type_name -> coder.tailnet.v2.CoordinateRequest.Disconnect
-	22, // 7: coder.tailnet.v2.CoordinateRequest.add_tunnel:type_name -> coder.tailnet.v2.CoordinateRequest.Tunnel
-	22, // 8: coder.tailnet.v2.CoordinateRequest.remove_tunnel:type_name -> coder.tailnet.v2.CoordinateRequest.Tunnel
-	23, // 9: coder.tailnet.v2.CoordinateRequest.ready_for_handshake:type_name -> coder.tailnet.v2.CoordinateRequest.ReadyForHandshake
-	24, // 10: coder.tailnet.v2.CoordinateResponse.peer_updates:type_name -> coder.tailnet.v2.CoordinateResponse.PeerUpdate
-	32, // 11: coder.tailnet.v2.Netcheck.MappingVariesByDestIP:type_name -> google.protobuf.BoolValue
-	32, // 12: coder.tailnet.v2.Netcheck.HairPinning:type_name -> google.protobuf.BoolValue
-	32, // 13: coder.tailnet.v2.Netcheck.UPnP:type_name -> google.protobuf.BoolValue
-	32, // 14: coder.tailnet.v2.Netcheck.PMP:type_name -> google.protobuf.BoolValue
-	32, // 15: coder.tailnet.v2.Netcheck.PCP:type_name -> google.protobuf.BoolValue
-	25, // 16: coder.tailnet.v2.Netcheck.RegionLatency:type_name -> coder.tailnet.v2.Netcheck.RegionLatencyEntry
-	26, // 17: coder.tailnet.v2.Netcheck.RegionV4Latency:type_name -> coder.tailnet.v2.Netcheck.RegionV4LatencyEntry
-	27, // 18: coder.tailnet.v2.Netcheck.RegionV6Latency:type_name -> coder.tailnet.v2.Netcheck.RegionV6LatencyEntry
-	32, // 19: coder.tailnet.v2.Netcheck.CaptivePortal:type_name -> google.protobuf.BoolValue
-	31, // 20: coder.tailnet.v2.TelemetryEvent.time:type_name -> google.protobuf.Timestamp
-	1,  // 21: coder.tailnet.v2.TelemetryEvent.status:type_name -> coder.tailnet.v2.TelemetryEvent.Status
-	2,  // 22: coder.tailnet.v2.TelemetryEvent.client_type:type_name -> coder.tailnet.v2.TelemetryEvent.ClientType
-	29, // 23: coder.tailnet.v2.TelemetryEvent.p2p_endpoint:type_name -> coder.tailnet.v2.TelemetryEvent.P2PEndpoint
-	30, // 24: coder.tailnet.v2.TelemetryEvent.log_ip_hashes:type_name -> coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry
-	4,  // 25: coder.tailnet.v2.TelemetryEvent.derp_map:type_name -> coder.tailnet.v2.DERPMap
-	9,  // 26: coder.tailnet.v2.TelemetryEvent.latest_netcheck:type_name -> coder.tailnet.v2.Netcheck
-	33, // 27: coder.tailnet.v2.TelemetryEvent.connection_age:type_name -> google.protobuf.Duration
-	33, // 28: coder.tailnet.v2.TelemetryEvent.connection_setup:type_name -> google.protobuf.Duration
-	33, // 29: coder.tailnet.v2.TelemetryEvent.p2p_setup:type_name -> google.protobuf.Duration
-	33, // 30: coder.tailnet.v2.TelemetryEvent.derp_latency:type_name -> google.protobuf.Duration
-	33, // 31: coder.tailnet.v2.TelemetryEvent.p2p_latency:type_name -> google.protobuf.Duration
-	34, // 32: coder.tailnet.v2.TelemetryEvent.throughput_mbits:type_name -> google.protobuf.FloatValue
-	10, // 33: coder.tailnet.v2.TelemetryRequest.events:type_name -> coder.tailnet.v2.TelemetryEvent
-	16, // 34: coder.tailnet.v2.DERPMap.HomeParams.region_score:type_name -> coder.tailnet.v2.DERPMap.HomeParams.RegionScoreEntry
-	17, // 35: coder.tailnet.v2.DERPMap.Region.nodes:type_name -> coder.tailnet.v2.DERPMap.Region.Node
-	14, // 36: coder.tailnet.v2.DERPMap.RegionsEntry.value:type_name -> coder.tailnet.v2.DERPMap.Region
-	6,  // 37: coder.tailnet.v2.CoordinateRequest.UpdateSelf.node:type_name -> coder.tailnet.v2.Node
-	6,  // 38: coder.tailnet.v2.CoordinateResponse.PeerUpdate.node:type_name -> coder.tailnet.v2.Node
-	0,  // 39: coder.tailnet.v2.CoordinateResponse.PeerUpdate.kind:type_name -> coder.tailnet.v2.CoordinateResponse.PeerUpdate.Kind
-	33, // 40: coder.tailnet.v2.Netcheck.RegionLatencyEntry.value:type_name -> google.protobuf.Duration
-	33, // 41: coder.tailnet.v2.Netcheck.RegionV4LatencyEntry.value:type_name -> google.protobuf.Duration
-	33, // 42: coder.tailnet.v2.Netcheck.RegionV6LatencyEntry.value:type_name -> google.protobuf.Duration
-	3,  // 43: coder.tailnet.v2.TelemetryEvent.IPFields.class:type_name -> coder.tailnet.v2.TelemetryEvent.IPClass
-	28, // 44: coder.tailnet.v2.TelemetryEvent.P2PEndpoint.fields:type_name -> coder.tailnet.v2.TelemetryEvent.IPFields
-	28, // 45: coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry.value:type_name -> coder.tailnet.v2.TelemetryEvent.IPFields
-	11, // 46: coder.tailnet.v2.Tailnet.PostTelemetry:input_type -> coder.tailnet.v2.TelemetryRequest
-	5,  // 47: coder.tailnet.v2.Tailnet.StreamDERPMaps:input_type -> coder.tailnet.v2.StreamDERPMapsRequest
-	7,  // 48: coder.tailnet.v2.Tailnet.Coordinate:input_type -> coder.tailnet.v2.CoordinateRequest
-	12, // 49: coder.tailnet.v2.Tailnet.PostTelemetry:output_type -> coder.tailnet.v2.TelemetryResponse
-	4,  // 50: coder.tailnet.v2.Tailnet.StreamDERPMaps:output_type -> coder.tailnet.v2.DERPMap
-	8,  // 51: coder.tailnet.v2.Tailnet.Coordinate:output_type -> coder.tailnet.v2.CoordinateResponse
-	49, // [49:52] is the sub-list for method output_type
-	46, // [46:49] is the sub-list for method input_type
-	46, // [46:46] is the sub-list for extension type_name
-	46, // [46:46] is the sub-list for extension extendee
-	0,  // [0:46] is the sub-list for field type_name
+	14, // 0: coder.tailnet.v2.DERPMap.home_params:type_name -> coder.tailnet.v2.DERPMap.HomeParams
+	16, // 1: coder.tailnet.v2.DERPMap.regions:type_name -> coder.tailnet.v2.DERPMap.RegionsEntry
+	32, // 2: coder.tailnet.v2.Node.as_of:type_name -> google.protobuf.Timestamp
+	19, // 3: coder.tailnet.v2.Node.derp_latency:type_name -> coder.tailnet.v2.Node.DerpLatencyEntry
+	20, // 4: coder.tailnet.v2.Node.derp_forced_websocket:type_name -> coder.tailnet.v2.Node.DerpForcedWebsocketEntry
+	21, // 5: coder.tailnet.v2.CoordinateRequest.update_self:type_name -> coder.tailnet.v2.CoordinateRequest.UpdateSelf
+	22, // 6: coder.tailnet.v2.CoordinateRequest.disconnect:type_name -> coder.tailnet.v2.CoordinateRequest.Disconnect
+	23, // 7: coder.tailnet.v2.CoordinateRequest.add_tunnel:type_name -> coder.tailnet.v2.CoordinateRequest.Tunnel
+	23, // 8: coder.tailnet.v2.CoordinateRequest.remove_tunnel:type_name -> coder.tailnet.v2.CoordinateRequest.Tunnel
+	24, // 9: coder.tailnet.v2.CoordinateRequest.ready_for_handshake:type_name -> coder.tailnet.v2.CoordinateRequest.ReadyForHandshake
+	25, // 10: coder.tailnet.v2.CoordinateResponse.peer_updates:type_name -> coder.tailnet.v2.CoordinateResponse.PeerUpdate
+	1,  // 11: coder.tailnet.v2.IPFields.class:type_name -> coder.tailnet.v2.IPFields.IPClass
+	33, // 12: coder.tailnet.v2.Netcheck.MappingVariesByDestIP:type_name -> google.protobuf.BoolValue
+	33, // 13: coder.tailnet.v2.Netcheck.HairPinning:type_name -> google.protobuf.BoolValue
+	33, // 14: coder.tailnet.v2.Netcheck.UPnP:type_name -> google.protobuf.BoolValue
+	33, // 15: coder.tailnet.v2.Netcheck.PMP:type_name -> google.protobuf.BoolValue
+	33, // 16: coder.tailnet.v2.Netcheck.PCP:type_name -> google.protobuf.BoolValue
+	26, // 17: coder.tailnet.v2.Netcheck.RegionLatency:type_name -> coder.tailnet.v2.Netcheck.RegionLatencyEntry
+	27, // 18: coder.tailnet.v2.Netcheck.RegionV4Latency:type_name -> coder.tailnet.v2.Netcheck.RegionV4LatencyEntry
+	28, // 19: coder.tailnet.v2.Netcheck.RegionV6Latency:type_name -> coder.tailnet.v2.Netcheck.RegionV6LatencyEntry
+	29, // 20: coder.tailnet.v2.Netcheck.GlobalV4:type_name -> coder.tailnet.v2.Netcheck.NetcheckIP
+	29, // 21: coder.tailnet.v2.Netcheck.GlobalV6:type_name -> coder.tailnet.v2.Netcheck.NetcheckIP
+	33, // 22: coder.tailnet.v2.Netcheck.CaptivePortal:type_name -> google.protobuf.BoolValue
+	32, // 23: coder.tailnet.v2.TelemetryEvent.time:type_name -> google.protobuf.Timestamp
+	2,  // 24: coder.tailnet.v2.TelemetryEvent.status:type_name -> coder.tailnet.v2.TelemetryEvent.Status
+	3,  // 25: coder.tailnet.v2.TelemetryEvent.client_type:type_name -> coder.tailnet.v2.TelemetryEvent.ClientType
+	30, // 26: coder.tailnet.v2.TelemetryEvent.p2p_endpoint:type_name -> coder.tailnet.v2.TelemetryEvent.P2PEndpoint
+	31, // 27: coder.tailnet.v2.TelemetryEvent.log_ip_hashes:type_name -> coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry
+	4,  // 28: coder.tailnet.v2.TelemetryEvent.derp_map:type_name -> coder.tailnet.v2.DERPMap
+	10, // 29: coder.tailnet.v2.TelemetryEvent.latest_netcheck:type_name -> coder.tailnet.v2.Netcheck
+	34, // 30: coder.tailnet.v2.TelemetryEvent.connection_age:type_name -> google.protobuf.Duration
+	34, // 31: coder.tailnet.v2.TelemetryEvent.connection_setup:type_name -> google.protobuf.Duration
+	34, // 32: coder.tailnet.v2.TelemetryEvent.p2p_setup:type_name -> google.protobuf.Duration
+	34, // 33: coder.tailnet.v2.TelemetryEvent.derp_latency:type_name -> google.protobuf.Duration
+	34, // 34: coder.tailnet.v2.TelemetryEvent.p2p_latency:type_name -> google.protobuf.Duration
+	35, // 35: coder.tailnet.v2.TelemetryEvent.throughput_mbits:type_name -> google.protobuf.FloatValue
+	11, // 36: coder.tailnet.v2.TelemetryRequest.events:type_name -> coder.tailnet.v2.TelemetryEvent
+	17, // 37: coder.tailnet.v2.DERPMap.HomeParams.region_score:type_name -> coder.tailnet.v2.DERPMap.HomeParams.RegionScoreEntry
+	18, // 38: coder.tailnet.v2.DERPMap.Region.nodes:type_name -> coder.tailnet.v2.DERPMap.Region.Node
+	15, // 39: coder.tailnet.v2.DERPMap.RegionsEntry.value:type_name -> coder.tailnet.v2.DERPMap.Region
+	6,  // 40: coder.tailnet.v2.CoordinateRequest.UpdateSelf.node:type_name -> coder.tailnet.v2.Node
+	6,  // 41: coder.tailnet.v2.CoordinateResponse.PeerUpdate.node:type_name -> coder.tailnet.v2.Node
+	0,  // 42: coder.tailnet.v2.CoordinateResponse.PeerUpdate.kind:type_name -> coder.tailnet.v2.CoordinateResponse.PeerUpdate.Kind
+	34, // 43: coder.tailnet.v2.Netcheck.RegionLatencyEntry.value:type_name -> google.protobuf.Duration
+	34, // 44: coder.tailnet.v2.Netcheck.RegionV4LatencyEntry.value:type_name -> google.protobuf.Duration
+	34, // 45: coder.tailnet.v2.Netcheck.RegionV6LatencyEntry.value:type_name -> google.protobuf.Duration
+	9,  // 46: coder.tailnet.v2.Netcheck.NetcheckIP.fields:type_name -> coder.tailnet.v2.IPFields
+	9,  // 47: coder.tailnet.v2.TelemetryEvent.P2PEndpoint.fields:type_name -> coder.tailnet.v2.IPFields
+	9,  // 48: coder.tailnet.v2.TelemetryEvent.LogIpHashesEntry.value:type_name -> coder.tailnet.v2.IPFields
+	12, // 49: coder.tailnet.v2.Tailnet.PostTelemetry:input_type -> coder.tailnet.v2.TelemetryRequest
+	5,  // 50: coder.tailnet.v2.Tailnet.StreamDERPMaps:input_type -> coder.tailnet.v2.StreamDERPMapsRequest
+	7,  // 51: coder.tailnet.v2.Tailnet.Coordinate:input_type -> coder.tailnet.v2.CoordinateRequest
+	13, // 52: coder.tailnet.v2.Tailnet.PostTelemetry:output_type -> coder.tailnet.v2.TelemetryResponse
+	4,  // 53: coder.tailnet.v2.Tailnet.StreamDERPMaps:output_type -> coder.tailnet.v2.DERPMap
+	8,  // 54: coder.tailnet.v2.Tailnet.Coordinate:output_type -> coder.tailnet.v2.CoordinateResponse
+	52, // [52:55] is the sub-list for method output_type
+	49, // [49:52] is the sub-list for method input_type
+	49, // [49:49] is the sub-list for extension type_name
+	49, // [49:49] is the sub-list for extension extendee
+	0,  // [0:49] is the sub-list for field type_name
 }
 
 func init() { file_tailnet_proto_tailnet_proto_init() }
@@ -2259,7 +2326,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Netcheck); i {
+			switch v := v.(*IPFields); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2271,7 +2338,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TelemetryEvent); i {
+			switch v := v.(*Netcheck); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2283,7 +2350,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TelemetryRequest); i {
+			switch v := v.(*TelemetryEvent); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2295,7 +2362,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TelemetryResponse); i {
+			switch v := v.(*TelemetryRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2307,7 +2374,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DERPMap_HomeParams); i {
+			switch v := v.(*TelemetryResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2319,6 +2386,18 @@ func file_tailnet_proto_tailnet_proto_init() {
 			}
 		}
 		file_tailnet_proto_tailnet_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DERPMap_HomeParams); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tailnet_proto_tailnet_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DERPMap_Region); i {
 			case 0:
 				return &v.state
@@ -2330,7 +2409,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DERPMap_Region_Node); i {
 			case 0:
 				return &v.state
@@ -2342,7 +2421,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CoordinateRequest_UpdateSelf); i {
 			case 0:
 				return &v.state
@@ -2354,7 +2433,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CoordinateRequest_Disconnect); i {
 			case 0:
 				return &v.state
@@ -2366,7 +2445,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CoordinateRequest_Tunnel); i {
 			case 0:
 				return &v.state
@@ -2378,7 +2457,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CoordinateRequest_ReadyForHandshake); i {
 			case 0:
 				return &v.state
@@ -2390,7 +2469,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CoordinateResponse_PeerUpdate); i {
 			case 0:
 				return &v.state
@@ -2402,8 +2481,8 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TelemetryEvent_IPFields); i {
+		file_tailnet_proto_tailnet_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Netcheck_NetcheckIP); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2414,7 +2493,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 				return nil
 			}
 		}
-		file_tailnet_proto_tailnet_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+		file_tailnet_proto_tailnet_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*TelemetryEvent_P2PEndpoint); i {
 			case 0:
 				return &v.state
@@ -2433,7 +2512,7 @@ func file_tailnet_proto_tailnet_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_tailnet_proto_tailnet_proto_rawDesc,
 			NumEnums:      4,
-			NumMessages:   27,
+			NumMessages:   28,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/tailnet/proto/tailnet.proto b/tailnet/proto/tailnet.proto
index cba3d83929d24..b4e4b50bbe992 100644
--- a/tailnet/proto/tailnet.proto
+++ b/tailnet/proto/tailnet.proto
@@ -102,6 +102,18 @@ message CoordinateResponse {
 	string error = 2;
 }
 
+message IPFields {
+	int32 version = 1;
+	enum IPClass {
+		PUBLIC = 0;
+		PRIVATE = 1;
+		LINK_LOCAL = 2;
+		UNIQUE_LOCAL = 3;
+		LOOPBACK = 4;
+	}
+	IPClass class = 2;
+}
+
 message Netcheck {
 	bool UDP = 1;
 	bool IPv6 = 2;
@@ -123,8 +135,12 @@ message Netcheck {
 	map<int64, google.protobuf.Duration> RegionV4Latency = 15;
 	map<int64, google.protobuf.Duration> RegionV6Latency = 16;
 
-	string GlobalV4 = 17;
-	string GlobalV6 = 18;
+	message NetcheckIP {
+		string hash = 1;
+		IPFields fields = 2;
+	}
+	NetcheckIP GlobalV4 = 17;
+	NetcheckIP GlobalV6 = 18;
 
 	google.protobuf.BoolValue CaptivePortal = 19;
 }
@@ -142,19 +158,6 @@ message TelemetryEvent {
 		WSPROXY = 3;
 	}
 
-	enum IPClass {
-		PUBLIC = 0;
-		PRIVATE = 1;
-		LINK_LOCAL = 2;
-		UNIQUE_LOCAL = 3;
-		LOOPBACK = 4;
-	}
-
-	message IPFields {
-		int32 version = 1;
-		IPClass class = 2;
-	}
-
 	message P2PEndpoint {
 		string hash = 1;
 		int32 port = 2;
@@ -167,8 +170,8 @@ message TelemetryEvent {
 	Status status = 4;
 	string disconnection_reason = 5;
 	ClientType client_type = 6;
-	string node_id_self = 7;
-	string node_id_remote = 8;
+	bytes node_id_self = 7;
+	bytes node_id_remote = 8;
 	P2PEndpoint p2p_endpoint = 9;
 	map<string, IPFields> log_ip_hashes = 10;
 	string home_derp = 11;
diff --git a/tailnet/service.go b/tailnet/service.go
index 870b7ff7a4a67..d118950c91447 100644
--- a/tailnet/service.go
+++ b/tailnet/service.go
@@ -4,18 +4,19 @@ import (
 	"context"
 	"io"
 	"net"
+	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/google/uuid"
 	"github.com/hashicorp/yamux"
-	"storj.io/drpc/drpcerr"
 	"storj.io/drpc/drpcmux"
 	"storj.io/drpc/drpcserver"
 	"tailscale.com/tailcfg"
 
 	"cdr.dev/slog"
 	"github.com/coder/coder/v2/apiversion"
+	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/tailnet/proto"
 
 	"golang.org/x/xerrors"
@@ -118,14 +119,94 @@ func (s ClientService) ServeConnV2(ctx context.Context, conn net.Conn, streamID
 
 // DRPCService is the dRPC-based, version 2.x of the tailnet API and implements proto.DRPCClientServer
 type DRPCService struct {
-	CoordPtr               *atomic.Pointer[Coordinator]
-	Logger                 slog.Logger
-	DerpMapUpdateFrequency time.Duration
-	DerpMapFn              func() *tailcfg.DERPMap
+	CoordPtr                       *atomic.Pointer[Coordinator]
+	Logger                         slog.Logger
+	DerpMapUpdateFrequency         time.Duration
+	DerpMapFn                      func() *tailcfg.DERPMap
+	NetworkTelemetryBatchFrequency time.Duration
+	NetworkTelemetryBatchMaxSize   int
+	NetworkTelemetryBatchFn        func(batch []telemetry.NetworkEvent)
+
+	mu                   sync.Mutex
+	pendingNetworkEvents []telemetry.NetworkEvent
+}
+
+func (s *DRPCService) writeTelemetryEvents(events []telemetry.NetworkEvent) {
+	if s.NetworkTelemetryBatchFn == nil {
+		return
+	}
+	s.NetworkTelemetryBatchFn(events)
 }
 
-func (*DRPCService) PostTelemetry(context.Context, *proto.TelemetryRequest) (*proto.TelemetryResponse, error) {
-	return nil, drpcerr.WithCode(xerrors.New("Unimplemented"), drpcerr.Unimplemented)
+func (s *DRPCService) sendTelemetryBatch() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	events := s.pendingNetworkEvents
+	s.pendingNetworkEvents = []telemetry.NetworkEvent{}
+	go s.writeTelemetryEvents(events)
+}
+
+// PeriodicTelemetryBatcher starts a goroutine to periodically send telemetry
+// events to the telemetry backend. The returned function is a cleanup function
+// that should be called when the service is no longer needed.
+//
+// Note: calling the returned function does not unblock any in-flight calls to
+// the underlying telemetry backend that come from PostTelemetry due to
+// s.TelemetryBatchMaxSize.
+func (s *DRPCService) PeriodicTelemetryBatcher() func() {
+	var (
+		closed = make(chan struct{})
+		done   = make(chan struct{})
+	)
+	if s.NetworkTelemetryBatchFn == nil {
+		return func() {}
+	}
+
+	go func() {
+		defer close(done)
+		ticker := time.NewTicker(s.NetworkTelemetryBatchFrequency)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ticker.C:
+				s.sendTelemetryBatch()
+			case <-closed:
+				// Send any remaining telemetry events before exiting.
+				s.sendTelemetryBatch()
+				return
+			}
+		}
+	}()
+
+	return func() {
+		close(closed)
+		<-done
+	}
+}
+
+func (s *DRPCService) PostTelemetry(_ context.Context, req *proto.TelemetryRequest) (*proto.TelemetryResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for _, pEvent := range req.Events {
+		tEvent, err := telemetry.NetworkEventFromProto(pEvent)
+		if err != nil {
+			// TODO(@deansheather): log? return an error?
+			continue
+		}
+
+		s.pendingNetworkEvents = append(s.pendingNetworkEvents, tEvent)
+
+		if len(s.pendingNetworkEvents) >= s.NetworkTelemetryBatchMaxSize {
+			events := s.pendingNetworkEvents
+			s.pendingNetworkEvents = []telemetry.NetworkEvent{}
+			// Perform the send in a goroutine to avoid blocking the DRPC call.
+			go s.writeTelemetryEvents(events)
+		}
+	}
+
+	return &proto.TelemetryResponse{}, nil
 }
 
 func (s *DRPCService) StreamDERPMaps(_ *proto.StreamDERPMapsRequest, stream proto.DRPCTailnet_StreamDERPMapsStream) error {

From 776f0430a07b28aff663db2e743ff78624e67f77 Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Thu, 27 Jun 2024 12:04:12 +0000
Subject: [PATCH 2/6] Progress

---
 coderd/agentapi/api.go        |   2 -
 coderd/agentapi/api_test.go   | 106 ++++++++++++++++++++++++++++++++++
 coderd/telemetry/telemetry.go |  16 ++---
 coderd/workspaceagentsrpc.go  |   2 +-
 tailnet/proto/tailnet.pb.go   |  16 ++---
 tailnet/proto/tailnet.proto   |   4 +-
 6 files changed, 121 insertions(+), 25 deletions(-)
 create mode 100644 coderd/agentapi/api_test.go

diff --git a/coderd/agentapi/api.go b/coderd/agentapi/api.go
index 37c84a966f4cb..f99731cb78ddf 100644
--- a/coderd/agentapi/api.go
+++ b/coderd/agentapi/api.go
@@ -22,7 +22,6 @@ import (
 	"github.com/coder/coder/v2/coderd/database/pubsub"
 	"github.com/coder/coder/v2/coderd/externalauth"
 	"github.com/coder/coder/v2/coderd/prometheusmetrics"
-	"github.com/coder/coder/v2/coderd/schedule"
 	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/tracing"
 	"github.com/coder/coder/v2/coderd/workspacestats"
@@ -62,7 +61,6 @@ type Options struct {
 	Pubsub                            pubsub.Pubsub
 	DerpMapFn                         func() *tailcfg.DERPMap
 	TailnetCoordinator                *atomic.Pointer[tailnet.Coordinator]
-	TemplateScheduleStore             *atomic.Pointer[schedule.TemplateScheduleStore]
 	StatsReporter                     *workspacestats.Reporter
 	AppearanceFetcher                 *atomic.Pointer[appearance.Fetcher]
 	PublishWorkspaceUpdateFn          func(ctx context.Context, workspaceID uuid.UUID)
diff --git a/coderd/agentapi/api_test.go b/coderd/agentapi/api_test.go
new file mode 100644
index 0000000000000..98b1e072d65bf
--- /dev/null
+++ b/coderd/agentapi/api_test.go
@@ -0,0 +1,106 @@
+package agentapi_test
+
+import (
+	"context"
+	"net/url"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/goleak"
+	"tailscale.com/tailcfg"
+
+	"cdr.dev/slog/sloggers/slogtest"
+	"github.com/coder/coder/v2/agent/proto"
+	"github.com/coder/coder/v2/coderd/agentapi"
+	"github.com/coder/coder/v2/coderd/appearance"
+	"github.com/coder/coder/v2/coderd/database/dbtestutil"
+	"github.com/coder/coder/v2/coderd/externalauth"
+	"github.com/coder/coder/v2/coderd/prometheusmetrics"
+	"github.com/coder/coder/v2/coderd/schedule"
+	"github.com/coder/coder/v2/coderd/telemetry"
+	"github.com/coder/coder/v2/coderd/workspacestats"
+	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/coder/v2/tailnet"
+	"github.com/coder/coder/v2/tailnet/tailnettest"
+	"github.com/coder/coder/v2/testutil"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}
+
+func Test_APIClose(t *testing.T) {
+	t.Parallel()
+
+	ctx := testutil.Context(t, testutil.WaitMedium)
+	log := slogtest.Make(t, nil)
+
+	db, pubsub := dbtestutil.NewDB(t)
+	fCoord := tailnettest.NewFakeCoordinator()
+	var coord tailnet.Coordinator = fCoord
+	coordPtr := atomic.Pointer[tailnet.Coordinator]{}
+	coordPtr.Store(&coord)
+
+	mockTemplateScheduleStore := schedule.MockTemplateScheduleStore{}
+	var templateScheduleStore schedule.TemplateScheduleStore = mockTemplateScheduleStore
+	templateScheduleStorePtr := atomic.Pointer[schedule.TemplateScheduleStore]{}
+	templateScheduleStorePtr.Store(&templateScheduleStore)
+
+	statsBatcher, closeBatcher, err := workspacestats.NewBatcher(ctx, workspacestats.BatcherWithStore(db))
+	require.NoError(t, err)
+	t.Cleanup(closeBatcher)
+	statsTracker := workspacestats.NewTracker(db)
+	t.Cleanup(func() {
+		_ = statsTracker.Close()
+	})
+	statsReporter := workspacestats.NewReporter(workspacestats.ReporterOptions{
+		Database:              db,
+		Logger:                log,
+		Pubsub:                pubsub,
+		TemplateScheduleStore: &templateScheduleStorePtr,
+		StatsBatcher:          statsBatcher,
+		UsageTracker:          statsTracker,
+		UpdateAgentMetricsFn:  func(_ context.Context, _ prometheusmetrics.AgentMetricLabels, _ []*proto.Stats_Metric) {},
+		AppStatBatchSize:      0,
+	})
+
+	appearanceFetcherPtr := atomic.Pointer[appearance.Fetcher]{}
+	appearanceFetcherPtr.Store(&appearance.DefaultFetcher)
+
+	api := agentapi.New(agentapi.Options{
+		AgentID:  uuid.New(),
+		Ctx:      ctx,
+		Log:      log,
+		Database: db,
+		Pubsub:   pubsub,
+		DerpMapFn: func() *tailcfg.DERPMap {
+			return &tailcfg.DERPMap{Regions: map[int]*tailcfg.DERPRegion{999: {RegionCode: "test"}}}
+		},
+		TailnetCoordinator:       &coordPtr,
+		StatsReporter:            statsReporter,
+		AppearanceFetcher:        &appearanceFetcherPtr,
+		PublishWorkspaceUpdateFn: func(_ context.Context, _ uuid.UUID) {},
+		NetworkTelemetryBatchFn:  func(_ []telemetry.NetworkEvent) {},
+		AccessURL: &url.URL{
+			Scheme: "http",
+			Host:   "localhost",
+		},
+		AppHostname:                    "",
+		AgentStatsRefreshInterval:      time.Second,
+		DisableDirectConnections:       false,
+		DerpForceWebSockets:            false,
+		DerpMapUpdateFrequency:         time.Second,
+		NetworkTelemetryBatchFrequency: time.Second,
+		NetworkTelemetryBatchMaxSize:   1,
+		ExternalAuthConfigs:            []*externalauth.Config{},
+		Experiments:                    codersdk.Experiments{},
+		WorkspaceID:                    uuid.New(),
+		UpdateAgentMetricsFn:           func(_ context.Context, _ prometheusmetrics.AgentMetricLabels, _ []*proto.Stats_Metric) {},
+	})
+
+	err = api.Close()
+	require.NoError(t, err)
+}
diff --git a/coderd/telemetry/telemetry.go b/coderd/telemetry/telemetry.go
index d2dfbaba44204..e35475c4add71 100644
--- a/coderd/telemetry/telemetry.go
+++ b/coderd/telemetry/telemetry.go
@@ -1240,8 +1240,8 @@ type NetworkEvent struct {
 	Status              string                          `json:"status"` // connected, disconnected
 	DisconnectionReason string                          `json:"disconnection_reason"`
 	ClientType          string                          `json:"client_type"` // cli, agent, coderd, wsproxy
-	NodeIDSelf          uuid.UUID                       `json:"node_id_self"`
-	NodeIDRemote        uuid.UUID                       `json:"node_id_remote"`
+	NodeIDSelf          uint64                          `json:"node_id_self"`
+	NodeIDRemote        uint64                          `json:"node_id_remote"`
 	P2PEndpoint         NetworkEventP2PEndpoint         `json:"p2p_endpoint"`
 	LogIPHashes         map[string]NetworkEventIPFields `json:"log_ip_hashes"`
 	HomeDERP            string                          `json:"home_derp"`
@@ -1272,14 +1272,6 @@ func NetworkEventFromProto(proto *tailnetproto.TelemetryEvent) (NetworkEvent, er
 	if err != nil {
 		return NetworkEvent{}, xerrors.Errorf("parse id %q: %w", proto.Id, err)
 	}
-	nodeIDSelf, err := uuid.ParseBytes(proto.NodeIdSelf)
-	if err != nil {
-		return NetworkEvent{}, xerrors.Errorf("parse node_id_self %q: %w", proto.NodeIdSelf, err)
-	}
-	nodeIDRemote, err := uuid.ParseBytes(proto.NodeIdRemote)
-	if err != nil {
-		return NetworkEvent{}, xerrors.Errorf("parse node_id_remote %q: %w", proto.NodeIdRemote, err)
-	}
 
 	logIPHashes := make(map[string]NetworkEventIPFields, len(proto.LogIpHashes))
 	for k, v := range proto.LogIpHashes {
@@ -1293,8 +1285,8 @@ func NetworkEventFromProto(proto *tailnetproto.TelemetryEvent) (NetworkEvent, er
 		Status:              strings.ToLower(proto.Status.String()),
 		DisconnectionReason: proto.DisconnectionReason,
 		ClientType:          strings.ToLower(proto.ClientType.String()),
-		NodeIDSelf:          nodeIDSelf,
-		NodeIDRemote:        nodeIDRemote,
+		NodeIDSelf:          proto.NodeIdSelf,
+		NodeIDRemote:        proto.NodeIdRemote,
 		P2PEndpoint:         p2pEndpointFromProto(proto.P2PEndpoint),
 		LogIPHashes:         logIPHashes,
 		HomeDERP:            proto.HomeDerp,
diff --git a/coderd/workspaceagentsrpc.go b/coderd/workspaceagentsrpc.go
index 9853d170eff7c..efa187bc14e98 100644
--- a/coderd/workspaceagentsrpc.go
+++ b/coderd/workspaceagentsrpc.go
@@ -131,7 +131,6 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 		Pubsub:                            api.Pubsub,
 		DerpMapFn:                         api.DERPMap,
 		TailnetCoordinator:                &api.TailnetCoordinator,
-		TemplateScheduleStore:             api.TemplateScheduleStore,
 		AppearanceFetcher:                 &api.AppearanceFetcher,
 		StatsReporter:                     api.statsReporter,
 		PublishWorkspaceUpdateFn:          api.publishWorkspaceUpdate,
@@ -157,6 +156,7 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 		WorkspaceID:          build.WorkspaceID, // saves the extra lookup later
 		UpdateAgentMetricsFn: api.UpdateAgentMetrics,
 	})
+	defer agentAPI.Close()
 
 	streamID := tailnet.StreamID{
 		Name: fmt.Sprintf("%s-%s-%s", owner.Username, workspace.Name, workspaceAgent.Name),
diff --git a/tailnet/proto/tailnet.pb.go b/tailnet/proto/tailnet.pb.go
index f293b7ba69f55..a9268f04d992c 100644
--- a/tailnet/proto/tailnet.pb.go
+++ b/tailnet/proto/tailnet.pb.go
@@ -835,8 +835,8 @@ type TelemetryEvent struct {
 	Status              TelemetryEvent_Status       `protobuf:"varint,4,opt,name=status,proto3,enum=coder.tailnet.v2.TelemetryEvent_Status" json:"status,omitempty"`
 	DisconnectionReason string                      `protobuf:"bytes,5,opt,name=disconnection_reason,json=disconnectionReason,proto3" json:"disconnection_reason,omitempty"`
 	ClientType          TelemetryEvent_ClientType   `protobuf:"varint,6,opt,name=client_type,json=clientType,proto3,enum=coder.tailnet.v2.TelemetryEvent_ClientType" json:"client_type,omitempty"`
-	NodeIdSelf          []byte                      `protobuf:"bytes,7,opt,name=node_id_self,json=nodeIdSelf,proto3" json:"node_id_self,omitempty"`
-	NodeIdRemote        []byte                      `protobuf:"bytes,8,opt,name=node_id_remote,json=nodeIdRemote,proto3" json:"node_id_remote,omitempty"`
+	NodeIdSelf          uint64                      `protobuf:"varint,7,opt,name=node_id_self,json=nodeIdSelf,proto3" json:"node_id_self,omitempty"`
+	NodeIdRemote        uint64                      `protobuf:"varint,8,opt,name=node_id_remote,json=nodeIdRemote,proto3" json:"node_id_remote,omitempty"`
 	P2PEndpoint         *TelemetryEvent_P2PEndpoint `protobuf:"bytes,9,opt,name=p2p_endpoint,json=p2pEndpoint,proto3" json:"p2p_endpoint,omitempty"`
 	LogIpHashes         map[string]*IPFields        `protobuf:"bytes,10,rep,name=log_ip_hashes,json=logIpHashes,proto3" json:"log_ip_hashes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	HomeDerp            string                      `protobuf:"bytes,11,opt,name=home_derp,json=homeDerp,proto3" json:"home_derp,omitempty"`
@@ -925,18 +925,18 @@ func (x *TelemetryEvent) GetClientType() TelemetryEvent_ClientType {
 	return TelemetryEvent_CLI
 }
 
-func (x *TelemetryEvent) GetNodeIdSelf() []byte {
+func (x *TelemetryEvent) GetNodeIdSelf() uint64 {
 	if x != nil {
 		return x.NodeIdSelf
 	}
-	return nil
+	return 0
 }
 
-func (x *TelemetryEvent) GetNodeIdRemote() []byte {
+func (x *TelemetryEvent) GetNodeIdRemote() uint64 {
 	if x != nil {
 		return x.NodeIdRemote
 	}
-	return nil
+	return 0
 }
 
 func (x *TelemetryEvent) GetP2PEndpoint() *TelemetryEvent_P2PEndpoint {
@@ -2046,10 +2046,10 @@ var file_tailnet_proto_tailnet_proto_rawDesc = []byte{
 	0x2e, 0x76, 0x32, 0x2e, 0x54, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x45, 0x76, 0x65,
 	0x6e, 0x74, 0x2e, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x54, 0x79, 0x70, 0x65, 0x52, 0x0a, 0x63,
 	0x6c, 0x69, 0x65, 0x6e, 0x74, 0x54, 0x79, 0x70, 0x65, 0x12, 0x20, 0x0a, 0x0c, 0x6e, 0x6f, 0x64,
-	0x65, 0x5f, 0x69, 0x64, 0x5f, 0x73, 0x65, 0x6c, 0x66, 0x18, 0x07, 0x20, 0x01, 0x28, 0x0c, 0x52,
+	0x65, 0x5f, 0x69, 0x64, 0x5f, 0x73, 0x65, 0x6c, 0x66, 0x18, 0x07, 0x20, 0x01, 0x28, 0x04, 0x52,
 	0x0a, 0x6e, 0x6f, 0x64, 0x65, 0x49, 0x64, 0x53, 0x65, 0x6c, 0x66, 0x12, 0x24, 0x0a, 0x0e, 0x6e,
 	0x6f, 0x64, 0x65, 0x5f, 0x69, 0x64, 0x5f, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x18, 0x08, 0x20,
-	0x01, 0x28, 0x0c, 0x52, 0x0c, 0x6e, 0x6f, 0x64, 0x65, 0x49, 0x64, 0x52, 0x65, 0x6d, 0x6f, 0x74,
+	0x01, 0x28, 0x04, 0x52, 0x0c, 0x6e, 0x6f, 0x64, 0x65, 0x49, 0x64, 0x52, 0x65, 0x6d, 0x6f, 0x74,
 	0x65, 0x12, 0x4f, 0x0a, 0x0c, 0x70, 0x32, 0x70, 0x5f, 0x65, 0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e,
 	0x74, 0x18, 0x09, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x2c, 0x2e, 0x63, 0x6f, 0x64, 0x65, 0x72, 0x2e,
 	0x74, 0x61, 0x69, 0x6c, 0x6e, 0x65, 0x74, 0x2e, 0x76, 0x32, 0x2e, 0x54, 0x65, 0x6c, 0x65, 0x6d,
diff --git a/tailnet/proto/tailnet.proto b/tailnet/proto/tailnet.proto
index b4e4b50bbe992..b8e97d8a7a493 100644
--- a/tailnet/proto/tailnet.proto
+++ b/tailnet/proto/tailnet.proto
@@ -170,8 +170,8 @@ message TelemetryEvent {
 	Status status = 4;
 	string disconnection_reason = 5;
 	ClientType client_type = 6;
-	bytes node_id_self = 7;
-	bytes node_id_remote = 8;
+	uint64 node_id_self = 7;
+	uint64 node_id_remote = 8;
 	P2PEndpoint p2p_endpoint = 9;
 	map<string, IPFields> log_ip_hashes = 10;
 	string home_derp = 11;

From 2148b6263388b9740472851257b1af248a9d3947 Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Thu, 27 Jun 2024 13:28:07 +0000
Subject: [PATCH 3/6] Avoid slim database import

---
 coderd/agentapi/api.go       |  3 +--
 coderd/agentapi/api_test.go  |  4 ++--
 coderd/workspaceagentsrpc.go | 15 +++++++++++--
 tailnet/service.go           | 42 ++++++++++++++++++++----------------
 4 files changed, 39 insertions(+), 25 deletions(-)

diff --git a/coderd/agentapi/api.go b/coderd/agentapi/api.go
index f99731cb78ddf..a5626c29d68b2 100644
--- a/coderd/agentapi/api.go
+++ b/coderd/agentapi/api.go
@@ -22,7 +22,6 @@ import (
 	"github.com/coder/coder/v2/coderd/database/pubsub"
 	"github.com/coder/coder/v2/coderd/externalauth"
 	"github.com/coder/coder/v2/coderd/prometheusmetrics"
-	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/tracing"
 	"github.com/coder/coder/v2/coderd/workspacestats"
 	"github.com/coder/coder/v2/codersdk"
@@ -65,7 +64,7 @@ type Options struct {
 	AppearanceFetcher                 *atomic.Pointer[appearance.Fetcher]
 	PublishWorkspaceUpdateFn          func(ctx context.Context, workspaceID uuid.UUID)
 	PublishWorkspaceAgentLogsUpdateFn func(ctx context.Context, workspaceAgentID uuid.UUID, msg agentsdk.LogsNotifyMessage)
-	NetworkTelemetryBatchFn           func(batch []telemetry.NetworkEvent)
+	NetworkTelemetryBatchFn           func(batch []*tailnetproto.TelemetryEvent)
 
 	AccessURL                      *url.URL
 	AppHostname                    string
diff --git a/coderd/agentapi/api_test.go b/coderd/agentapi/api_test.go
index 98b1e072d65bf..2a14c4d735e73 100644
--- a/coderd/agentapi/api_test.go
+++ b/coderd/agentapi/api_test.go
@@ -20,10 +20,10 @@ import (
 	"github.com/coder/coder/v2/coderd/externalauth"
 	"github.com/coder/coder/v2/coderd/prometheusmetrics"
 	"github.com/coder/coder/v2/coderd/schedule"
-	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/workspacestats"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/tailnet"
+	tailnetproto "github.com/coder/coder/v2/tailnet/proto"
 	"github.com/coder/coder/v2/tailnet/tailnettest"
 	"github.com/coder/coder/v2/testutil"
 )
@@ -83,7 +83,7 @@ func Test_APIClose(t *testing.T) {
 		StatsReporter:            statsReporter,
 		AppearanceFetcher:        &appearanceFetcherPtr,
 		PublishWorkspaceUpdateFn: func(_ context.Context, _ uuid.UUID) {},
-		NetworkTelemetryBatchFn:  func(_ []telemetry.NetworkEvent) {},
+		NetworkTelemetryBatchFn:  func(_ []*tailnetproto.TelemetryEvent) {},
 		AccessURL: &url.URL{
 			Scheme: "http",
 			Host:   "localhost",
diff --git a/coderd/workspaceagentsrpc.go b/coderd/workspaceagentsrpc.go
index efa187bc14e98..27fac31a7f01f 100644
--- a/coderd/workspaceagentsrpc.go
+++ b/coderd/workspaceagentsrpc.go
@@ -28,6 +28,7 @@ import (
 	"github.com/coder/coder/v2/coderd/util/ptr"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/tailnet"
+	tailnetproto "github.com/coder/coder/v2/tailnet/proto"
 )
 
 // @Summary Workspace agent RPC API
@@ -135,9 +136,19 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 		StatsReporter:                     api.statsReporter,
 		PublishWorkspaceUpdateFn:          api.publishWorkspaceUpdate,
 		PublishWorkspaceAgentLogsUpdateFn: api.publishWorkspaceAgentLogsUpdate,
-		NetworkTelemetryBatchFn: func(batch []telemetry.NetworkEvent) {
+		NetworkTelemetryBatchFn: func(batch []*tailnetproto.TelemetryEvent) {
+			telemetryEvents := make([]telemetry.NetworkEvent, 0, len(batch))
+			for _, pEvent := range batch {
+				tEvent, err := telemetry.NetworkEventFromProto(pEvent)
+				if err != nil {
+					// Events that fail to be converted get discarded for now.
+					continue
+				}
+				telemetryEvents = append(telemetryEvents, tEvent)
+			}
+
 			api.Telemetry.Report(&telemetry.Snapshot{
-				NetworkEvents: batch,
+				NetworkEvents: telemetryEvents,
 			})
 		},
 
diff --git a/tailnet/service.go b/tailnet/service.go
index d118950c91447..a7b9de911456b 100644
--- a/tailnet/service.go
+++ b/tailnet/service.go
@@ -10,16 +10,14 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/hashicorp/yamux"
+	"golang.org/x/xerrors"
 	"storj.io/drpc/drpcmux"
 	"storj.io/drpc/drpcserver"
 	"tailscale.com/tailcfg"
 
 	"cdr.dev/slog"
 	"github.com/coder/coder/v2/apiversion"
-	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/tailnet/proto"
-
-	"golang.org/x/xerrors"
 )
 
 type streamIDContextKey struct{}
@@ -125,13 +123,14 @@ type DRPCService struct {
 	DerpMapFn                      func() *tailcfg.DERPMap
 	NetworkTelemetryBatchFrequency time.Duration
 	NetworkTelemetryBatchMaxSize   int
-	NetworkTelemetryBatchFn        func(batch []telemetry.NetworkEvent)
+	NetworkTelemetryBatchFn        func(batch []*proto.TelemetryEvent)
 
-	mu                   sync.Mutex
-	pendingNetworkEvents []telemetry.NetworkEvent
+	mu                      sync.Mutex
+	networkEventBatchTicker *time.Ticker
+	pendingNetworkEvents    []*proto.TelemetryEvent
 }
 
-func (s *DRPCService) writeTelemetryEvents(events []telemetry.NetworkEvent) {
+func (s *DRPCService) writeTelemetryEvents(events []*proto.TelemetryEvent) {
 	if s.NetworkTelemetryBatchFn == nil {
 		return
 	}
@@ -142,13 +141,14 @@ func (s *DRPCService) sendTelemetryBatch() {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	events := s.pendingNetworkEvents
-	s.pendingNetworkEvents = []telemetry.NetworkEvent{}
+	s.pendingNetworkEvents = []*proto.TelemetryEvent{}
 	go s.writeTelemetryEvents(events)
 }
 
 // PeriodicTelemetryBatcher starts a goroutine to periodically send telemetry
 // events to the telemetry backend. The returned function is a cleanup function
-// that should be called when the service is no longer needed.
+// that should be called when the service is no longer needed. Calling this more
+// than once will panic.
 //
 // Note: calling the returned function does not unblock any in-flight calls to
 // the underlying telemetry backend that come from PostTelemetry due to
@@ -162,9 +162,16 @@ func (s *DRPCService) PeriodicTelemetryBatcher() func() {
 		return func() {}
 	}
 
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.networkEventBatchTicker != nil {
+		panic("PeriodicTelemetryBatcher called more than once")
+	}
+	ticker := time.NewTicker(s.NetworkTelemetryBatchFrequency)
+	s.networkEventBatchTicker = ticker
+
 	go func() {
 		defer close(done)
-		ticker := time.NewTicker(s.NetworkTelemetryBatchFrequency)
 		defer ticker.Stop()
 
 		for {
@@ -189,19 +196,16 @@ func (s *DRPCService) PostTelemetry(_ context.Context, req *proto.TelemetryReque
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
-	for _, pEvent := range req.Events {
-		tEvent, err := telemetry.NetworkEventFromProto(pEvent)
-		if err != nil {
-			// TODO(@deansheather): log? return an error?
-			continue
-		}
-
-		s.pendingNetworkEvents = append(s.pendingNetworkEvents, tEvent)
+	for _, event := range req.Events {
+		s.pendingNetworkEvents = append(s.pendingNetworkEvents, event)
 
 		if len(s.pendingNetworkEvents) >= s.NetworkTelemetryBatchMaxSize {
 			events := s.pendingNetworkEvents
-			s.pendingNetworkEvents = []telemetry.NetworkEvent{}
+			s.pendingNetworkEvents = []*proto.TelemetryEvent{}
 			// Perform the send in a goroutine to avoid blocking the DRPC call.
+			if s.networkEventBatchTicker != nil {
+				s.networkEventBatchTicker.Reset(s.NetworkTelemetryBatchFrequency)
+			}
 			go s.writeTelemetryEvents(events)
 		}
 	}

From c3123494513ad3b8361eac5f6032df3e3625c0d6 Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Thu, 27 Jun 2024 14:43:03 +0000
Subject: [PATCH 4/6] Refactor network telemetry batching

---
 coderd/agentapi/api.go                        |  41 ++--
 coderd/agentapi/api_test.go                   | 106 ---------
 coderd/coderd.go                              |  18 +-
 coderd/workspaceagentsrpc.go                  |  51 +++--
 .../workspacesdk/connector_internal_test.go   |  11 +-
 enterprise/coderd/coderd.go                   |  13 +-
 enterprise/tailnet/workspaceproxy.go          |  19 +-
 .../wsproxy/wsproxysdk/wsproxysdk_test.go     |  12 +-
 tailnet/coordinator_test.go                   |  24 ++-
 tailnet/service.go                            | 204 +++++++++---------
 tailnet/service_test.go                       |  22 +-
 tailnet/test/integration/integration.go       |  17 +-
 12 files changed, 228 insertions(+), 310 deletions(-)
 delete mode 100644 coderd/agentapi/api_test.go

diff --git a/coderd/agentapi/api.go b/coderd/agentapi/api.go
index a5626c29d68b2..7aeb3a7de9d78 100644
--- a/coderd/agentapi/api.go
+++ b/coderd/agentapi/api.go
@@ -46,7 +46,6 @@ type API struct {
 
 	mu                sync.Mutex
 	cachedWorkspaceID uuid.UUID
-	drpcServiceClose  func()
 }
 
 var _ agentproto.DRPCAgentServer = &API{}
@@ -64,18 +63,16 @@ type Options struct {
 	AppearanceFetcher                 *atomic.Pointer[appearance.Fetcher]
 	PublishWorkspaceUpdateFn          func(ctx context.Context, workspaceID uuid.UUID)
 	PublishWorkspaceAgentLogsUpdateFn func(ctx context.Context, workspaceAgentID uuid.UUID, msg agentsdk.LogsNotifyMessage)
-	NetworkTelemetryBatchFn           func(batch []*tailnetproto.TelemetryEvent)
-
-	AccessURL                      *url.URL
-	AppHostname                    string
-	AgentStatsRefreshInterval      time.Duration
-	DisableDirectConnections       bool
-	DerpForceWebSockets            bool
-	DerpMapUpdateFrequency         time.Duration
-	NetworkTelemetryBatchFrequency time.Duration
-	NetworkTelemetryBatchMaxSize   int
-	ExternalAuthConfigs            []*externalauth.Config
-	Experiments                    codersdk.Experiments
+	NetworkTelemetryHandler           func(batch []*tailnetproto.TelemetryEvent)
+
+	AccessURL                 *url.URL
+	AppHostname               string
+	AgentStatsRefreshInterval time.Duration
+	DisableDirectConnections  bool
+	DerpForceWebSockets       bool
+	DerpMapUpdateFrequency    time.Duration
+	ExternalAuthConfigs       []*externalauth.Config
+	Experiments               codersdk.Experiments
 
 	// Optional:
 	// WorkspaceID avoids a future lookup to find the workspace ID by setting
@@ -156,24 +153,16 @@ func New(opts Options) *API {
 	}
 
 	api.DRPCService = &tailnet.DRPCService{
-		CoordPtr:                       opts.TailnetCoordinator,
-		Logger:                         opts.Log,
-		DerpMapUpdateFrequency:         opts.DerpMapUpdateFrequency,
-		DerpMapFn:                      opts.DerpMapFn,
-		NetworkTelemetryBatchFrequency: opts.NetworkTelemetryBatchFrequency,
-		NetworkTelemetryBatchMaxSize:   opts.NetworkTelemetryBatchMaxSize,
-		NetworkTelemetryBatchFn:        opts.NetworkTelemetryBatchFn,
+		CoordPtr:                opts.TailnetCoordinator,
+		Logger:                  opts.Log,
+		DerpMapUpdateFrequency:  opts.DerpMapUpdateFrequency,
+		DerpMapFn:               opts.DerpMapFn,
+		NetworkTelemetryHandler: opts.NetworkTelemetryHandler,
 	}
-	api.drpcServiceClose = api.DRPCService.PeriodicTelemetryBatcher()
 
 	return api
 }
 
-func (a *API) Close() error {
-	a.drpcServiceClose()
-	return nil
-}
-
 func (a *API) Server(ctx context.Context) (*drpcserver.Server, error) {
 	mux := drpcmux.New()
 	err := agentproto.DRPCRegisterAgent(mux, a)
diff --git a/coderd/agentapi/api_test.go b/coderd/agentapi/api_test.go
deleted file mode 100644
index 2a14c4d735e73..0000000000000
--- a/coderd/agentapi/api_test.go
+++ /dev/null
@@ -1,106 +0,0 @@
-package agentapi_test
-
-import (
-	"context"
-	"net/url"
-	"sync/atomic"
-	"testing"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/stretchr/testify/require"
-	"go.uber.org/goleak"
-	"tailscale.com/tailcfg"
-
-	"cdr.dev/slog/sloggers/slogtest"
-	"github.com/coder/coder/v2/agent/proto"
-	"github.com/coder/coder/v2/coderd/agentapi"
-	"github.com/coder/coder/v2/coderd/appearance"
-	"github.com/coder/coder/v2/coderd/database/dbtestutil"
-	"github.com/coder/coder/v2/coderd/externalauth"
-	"github.com/coder/coder/v2/coderd/prometheusmetrics"
-	"github.com/coder/coder/v2/coderd/schedule"
-	"github.com/coder/coder/v2/coderd/workspacestats"
-	"github.com/coder/coder/v2/codersdk"
-	"github.com/coder/coder/v2/tailnet"
-	tailnetproto "github.com/coder/coder/v2/tailnet/proto"
-	"github.com/coder/coder/v2/tailnet/tailnettest"
-	"github.com/coder/coder/v2/testutil"
-)
-
-func TestMain(m *testing.M) {
-	goleak.VerifyTestMain(m)
-}
-
-func Test_APIClose(t *testing.T) {
-	t.Parallel()
-
-	ctx := testutil.Context(t, testutil.WaitMedium)
-	log := slogtest.Make(t, nil)
-
-	db, pubsub := dbtestutil.NewDB(t)
-	fCoord := tailnettest.NewFakeCoordinator()
-	var coord tailnet.Coordinator = fCoord
-	coordPtr := atomic.Pointer[tailnet.Coordinator]{}
-	coordPtr.Store(&coord)
-
-	mockTemplateScheduleStore := schedule.MockTemplateScheduleStore{}
-	var templateScheduleStore schedule.TemplateScheduleStore = mockTemplateScheduleStore
-	templateScheduleStorePtr := atomic.Pointer[schedule.TemplateScheduleStore]{}
-	templateScheduleStorePtr.Store(&templateScheduleStore)
-
-	statsBatcher, closeBatcher, err := workspacestats.NewBatcher(ctx, workspacestats.BatcherWithStore(db))
-	require.NoError(t, err)
-	t.Cleanup(closeBatcher)
-	statsTracker := workspacestats.NewTracker(db)
-	t.Cleanup(func() {
-		_ = statsTracker.Close()
-	})
-	statsReporter := workspacestats.NewReporter(workspacestats.ReporterOptions{
-		Database:              db,
-		Logger:                log,
-		Pubsub:                pubsub,
-		TemplateScheduleStore: &templateScheduleStorePtr,
-		StatsBatcher:          statsBatcher,
-		UsageTracker:          statsTracker,
-		UpdateAgentMetricsFn:  func(_ context.Context, _ prometheusmetrics.AgentMetricLabels, _ []*proto.Stats_Metric) {},
-		AppStatBatchSize:      0,
-	})
-
-	appearanceFetcherPtr := atomic.Pointer[appearance.Fetcher]{}
-	appearanceFetcherPtr.Store(&appearance.DefaultFetcher)
-
-	api := agentapi.New(agentapi.Options{
-		AgentID:  uuid.New(),
-		Ctx:      ctx,
-		Log:      log,
-		Database: db,
-		Pubsub:   pubsub,
-		DerpMapFn: func() *tailcfg.DERPMap {
-			return &tailcfg.DERPMap{Regions: map[int]*tailcfg.DERPRegion{999: {RegionCode: "test"}}}
-		},
-		TailnetCoordinator:       &coordPtr,
-		StatsReporter:            statsReporter,
-		AppearanceFetcher:        &appearanceFetcherPtr,
-		PublishWorkspaceUpdateFn: func(_ context.Context, _ uuid.UUID) {},
-		NetworkTelemetryBatchFn:  func(_ []*tailnetproto.TelemetryEvent) {},
-		AccessURL: &url.URL{
-			Scheme: "http",
-			Host:   "localhost",
-		},
-		AppHostname:                    "",
-		AgentStatsRefreshInterval:      time.Second,
-		DisableDirectConnections:       false,
-		DerpForceWebSockets:            false,
-		DerpMapUpdateFrequency:         time.Second,
-		NetworkTelemetryBatchFrequency: time.Second,
-		NetworkTelemetryBatchMaxSize:   1,
-		ExternalAuthConfigs:            []*externalauth.Config{},
-		Experiments:                    codersdk.Experiments{},
-		WorkspaceID:                    uuid.New(),
-		UpdateAgentMetricsFn:           func(_ context.Context, _ prometheusmetrics.AgentMetricLabels, _ []*proto.Stats_Metric) {},
-	})
-
-	err = api.Close()
-	require.NoError(t, err)
-}
diff --git a/coderd/coderd.go b/coderd/coderd.go
index 292b0cb171574..02761d13a3646 100644
--- a/coderd/coderd.go
+++ b/coderd/coderd.go
@@ -547,12 +547,18 @@ func New(options *Options) *API {
 	if options.DeploymentValues.Prometheus.Enable {
 		options.PrometheusRegistry.MustRegister(stn)
 	}
-	api.TailnetClientService, err = tailnet.NewClientService(
-		api.Logger.Named("tailnetclient"),
-		&api.TailnetCoordinator,
-		api.Options.DERPMapUpdateFrequency,
-		api.DERPMap,
+	api.NetworkTelemetryBatcher = tailnet.NewNetworkTelemetryBatcher(
+		api.Options.NetworkTelemetryBatchFrequency,
+		api.Options.NetworkTelemetryBatchMaxSize,
+		api.handleNetworkTelemetry,
 	)
+	api.TailnetClientService, err = tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  api.Logger.Named("tailnetclient"),
+		CoordPtr:                &api.TailnetCoordinator,
+		DERPMapUpdateFrequency:  api.Options.DERPMapUpdateFrequency,
+		DERPMapFn:               api.DERPMap,
+		NetworkTelemetryHandler: api.NetworkTelemetryBatcher.Handler,
+	})
 	if err != nil {
 		api.Logger.Fatal(api.ctx, "failed to initialize tailnet client service", slog.Error(err))
 	}
@@ -1263,6 +1269,7 @@ type API struct {
 	Auditor                           atomic.Pointer[audit.Auditor]
 	WorkspaceClientCoordinateOverride atomic.Pointer[func(rw http.ResponseWriter) bool]
 	TailnetCoordinator                atomic.Pointer[tailnet.Coordinator]
+	NetworkTelemetryBatcher           *tailnet.NetworkTelemetryBatcher
 	TailnetClientService              *tailnet.ClientService
 	QuotaCommitter                    atomic.Pointer[proto.QuotaCommitter]
 	AppearanceFetcher                 atomic.Pointer[appearance.Fetcher]
@@ -1356,6 +1363,7 @@ func (api *API) Close() error {
 	}
 	_ = api.agentProvider.Close()
 	_ = api.statsReporter.Close()
+	_ = api.NetworkTelemetryBatcher.Close()
 	return nil
 }
 
diff --git a/coderd/workspaceagentsrpc.go b/coderd/workspaceagentsrpc.go
index 27fac31a7f01f..cd37349f25634 100644
--- a/coderd/workspaceagentsrpc.go
+++ b/coderd/workspaceagentsrpc.go
@@ -136,38 +136,21 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 		StatsReporter:                     api.statsReporter,
 		PublishWorkspaceUpdateFn:          api.publishWorkspaceUpdate,
 		PublishWorkspaceAgentLogsUpdateFn: api.publishWorkspaceAgentLogsUpdate,
-		NetworkTelemetryBatchFn: func(batch []*tailnetproto.TelemetryEvent) {
-			telemetryEvents := make([]telemetry.NetworkEvent, 0, len(batch))
-			for _, pEvent := range batch {
-				tEvent, err := telemetry.NetworkEventFromProto(pEvent)
-				if err != nil {
-					// Events that fail to be converted get discarded for now.
-					continue
-				}
-				telemetryEvents = append(telemetryEvents, tEvent)
-			}
-
-			api.Telemetry.Report(&telemetry.Snapshot{
-				NetworkEvents: telemetryEvents,
-			})
-		},
+		NetworkTelemetryHandler:           api.NetworkTelemetryBatcher.Handler,
 
-		AccessURL:                      api.AccessURL,
-		AppHostname:                    api.AppHostname,
-		AgentStatsRefreshInterval:      api.AgentStatsRefreshInterval,
-		DisableDirectConnections:       api.DeploymentValues.DERP.Config.BlockDirect.Value(),
-		DerpForceWebSockets:            api.DeploymentValues.DERP.Config.ForceWebSockets.Value(),
-		DerpMapUpdateFrequency:         api.Options.DERPMapUpdateFrequency,
-		NetworkTelemetryBatchFrequency: api.Options.NetworkTelemetryBatchFrequency,
-		NetworkTelemetryBatchMaxSize:   api.Options.NetworkTelemetryBatchMaxSize,
-		ExternalAuthConfigs:            api.ExternalAuthConfigs,
-		Experiments:                    api.Experiments,
+		AccessURL:                 api.AccessURL,
+		AppHostname:               api.AppHostname,
+		AgentStatsRefreshInterval: api.AgentStatsRefreshInterval,
+		DisableDirectConnections:  api.DeploymentValues.DERP.Config.BlockDirect.Value(),
+		DerpForceWebSockets:       api.DeploymentValues.DERP.Config.ForceWebSockets.Value(),
+		DerpMapUpdateFrequency:    api.Options.DERPMapUpdateFrequency,
+		ExternalAuthConfigs:       api.ExternalAuthConfigs,
+		Experiments:               api.Experiments,
 
 		// Optional:
 		WorkspaceID:          build.WorkspaceID, // saves the extra lookup later
 		UpdateAgentMetricsFn: api.UpdateAgentMetrics,
 	})
-	defer agentAPI.Close()
 
 	streamID := tailnet.StreamID{
 		Name: fmt.Sprintf("%s-%s-%s", owner.Username, workspace.Name, workspaceAgent.Name),
@@ -184,6 +167,22 @@ func (api *API) workspaceAgentRPC(rw http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (api *API) handleNetworkTelemetry(batch []*tailnetproto.TelemetryEvent) {
+	telemetryEvents := make([]telemetry.NetworkEvent, 0, len(batch))
+	for _, pEvent := range batch {
+		tEvent, err := telemetry.NetworkEventFromProto(pEvent)
+		if err != nil {
+			// Events that fail to be converted get discarded for now.
+			continue
+		}
+		telemetryEvents = append(telemetryEvents, tEvent)
+	}
+
+	api.Telemetry.Report(&telemetry.Snapshot{
+		NetworkEvents: telemetryEvents,
+	})
+}
+
 type yamuxPingerCloser struct {
 	mux *yamux.Session
 }
diff --git a/codersdk/workspacesdk/connector_internal_test.go b/codersdk/workspacesdk/connector_internal_test.go
index c7fc036ffa2a1..2e5716ee17870 100644
--- a/codersdk/workspacesdk/connector_internal_test.go
+++ b/codersdk/workspacesdk/connector_internal_test.go
@@ -50,10 +50,13 @@ func TestTailnetAPIConnector_Disconnects(t *testing.T) {
 	coordPtr.Store(&coord)
 	derpMapCh := make(chan *tailcfg.DERPMap)
 	defer close(derpMapCh)
-	svc, err := tailnet.NewClientService(
-		logger, &coordPtr,
-		time.Millisecond, func() *tailcfg.DERPMap { return <-derpMapCh },
-	)
+	svc, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  logger,
+		CoordPtr:                &coordPtr,
+		DERPMapUpdateFrequency:  time.Millisecond,
+		DERPMapFn:               func() *tailcfg.DERPMap { return <-derpMapCh },
+		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) {},
+	})
 	require.NoError(t, err)
 
 	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
diff --git a/enterprise/coderd/coderd.go b/enterprise/coderd/coderd.go
index 743bd628d8630..cfdfbddb79940 100644
--- a/enterprise/coderd/coderd.go
+++ b/enterprise/coderd/coderd.go
@@ -138,12 +138,13 @@ func New(ctx context.Context, options *Options) (_ *API, err error) {
 		}
 		return api.fetchRegions(ctx)
 	}
-	api.tailnetService, err = tailnet.NewClientService(
-		api.Logger.Named("tailnetclient"),
-		&api.AGPL.TailnetCoordinator,
-		api.Options.DERPMapUpdateFrequency,
-		api.AGPL.DERPMap,
-	)
+	api.tailnetService, err = tailnet.NewClientService(agpltailnet.ClientServiceOptions{
+		Logger:                  api.Logger.Named("tailnetclient"),
+		CoordPtr:                &api.AGPL.TailnetCoordinator,
+		DERPMapUpdateFrequency:  api.Options.DERPMapUpdateFrequency,
+		DERPMapFn:               api.AGPL.DERPMap,
+		NetworkTelemetryHandler: api.AGPL.NetworkTelemetryBatcher.Handler,
+	})
 	if err != nil {
 		api.Logger.Fatal(api.ctx, "failed to initialize tailnet client service", slog.Error(err))
 	}
diff --git a/enterprise/tailnet/workspaceproxy.go b/enterprise/tailnet/workspaceproxy.go
index 22cc0b3e73b6e..674536755434f 100644
--- a/enterprise/tailnet/workspaceproxy.go
+++ b/enterprise/tailnet/workspaceproxy.go
@@ -6,12 +6,10 @@ import (
 	"encoding/json"
 	"errors"
 	"net"
-	"sync/atomic"
 	"time"
 
 	"github.com/google/uuid"
 	"golang.org/x/xerrors"
-	"tailscale.com/tailcfg"
 
 	"cdr.dev/slog"
 	"github.com/coder/coder/v2/apiversion"
@@ -25,15 +23,14 @@ type ClientService struct {
 
 // NewClientService returns a ClientService based on the given Coordinator pointer.  The pointer is
 // loaded on each processed connection.
-func NewClientService(
-	logger slog.Logger,
-	coordPtr *atomic.Pointer[agpl.Coordinator],
-	derpMapUpdateFrequency time.Duration,
-	derpMapFn func() *tailcfg.DERPMap,
-) (
-	*ClientService, error,
-) {
-	s, err := agpl.NewClientService(logger, coordPtr, derpMapUpdateFrequency, derpMapFn)
+func NewClientService(options agpl.ClientServiceOptions) (*ClientService, error) {
+	s, err := agpl.NewClientService(agpl.ClientServiceOptions{
+		Logger:                  options.Logger,
+		CoordPtr:                options.CoordPtr,
+		DERPMapUpdateFrequency:  options.DERPMapUpdateFrequency,
+		DERPMapFn:               options.DERPMapFn,
+		NetworkTelemetryHandler: options.NetworkTelemetryHandler,
+	})
 	if err != nil {
 		return nil, err
 	}
diff --git a/enterprise/wsproxy/wsproxysdk/wsproxysdk_test.go b/enterprise/wsproxy/wsproxysdk/wsproxysdk_test.go
index c94b712cc9872..1ed49881092fb 100644
--- a/enterprise/wsproxy/wsproxysdk/wsproxysdk_test.go
+++ b/enterprise/wsproxy/wsproxysdk/wsproxysdk_test.go
@@ -171,11 +171,13 @@ func TestDialCoordinator(t *testing.T) {
 
 		coordPtr := atomic.Pointer[agpl.Coordinator]{}
 		coordPtr.Store(&coord)
-		cSrv, err := tailnet.NewClientService(
-			logger, &coordPtr,
-			time.Hour,
-			func() *tailcfg.DERPMap { panic("not implemented") },
-		)
+		cSrv, err := tailnet.NewClientService(agpl.ClientServiceOptions{
+			Logger:                  logger,
+			CoordPtr:                &coordPtr,
+			DERPMapUpdateFrequency:  time.Hour,
+			DERPMapFn:               func() *tailcfg.DERPMap { panic("not implemented") },
+			NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) { panic("not implemented") },
+		})
 		require.NoError(t, err)
 
 		// buffer the channels here, so we don't need to read and write in goroutines to
diff --git a/tailnet/coordinator_test.go b/tailnet/coordinator_test.go
index ddf5006614645..cdf288c98ddb9 100644
--- a/tailnet/coordinator_test.go
+++ b/tailnet/coordinator_test.go
@@ -624,11 +624,13 @@ func TestRemoteCoordination(t *testing.T) {
 	var coord tailnet.Coordinator = mCoord
 	coordPtr := atomic.Pointer[tailnet.Coordinator]{}
 	coordPtr.Store(&coord)
-	svc, err := tailnet.NewClientService(
-		logger.Named("svc"), &coordPtr,
-		time.Hour,
-		func() *tailcfg.DERPMap { panic("not implemented") },
-	)
+	svc, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  logger.Named("svc"),
+		CoordPtr:                &coordPtr,
+		DERPMapUpdateFrequency:  time.Hour,
+		DERPMapFn:               func() *tailcfg.DERPMap { panic("not implemented") },
+		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) { panic("not implemented") },
+	})
 	require.NoError(t, err)
 	sC, cC := net.Pipe()
 
@@ -673,11 +675,13 @@ func TestRemoteCoordination_SendsReadyForHandshake(t *testing.T) {
 	var coord tailnet.Coordinator = mCoord
 	coordPtr := atomic.Pointer[tailnet.Coordinator]{}
 	coordPtr.Store(&coord)
-	svc, err := tailnet.NewClientService(
-		logger.Named("svc"), &coordPtr,
-		time.Hour,
-		func() *tailcfg.DERPMap { panic("not implemented") },
-	)
+	svc, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  logger.Named("svc"),
+		CoordPtr:                &coordPtr,
+		DERPMapUpdateFrequency:  time.Hour,
+		DERPMapFn:               func() *tailcfg.DERPMap { panic("not implemented") },
+		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) { panic("not implemented") },
+	})
 	require.NoError(t, err)
 	sC, cC := net.Pipe()
 
diff --git a/tailnet/service.go b/tailnet/service.go
index a7b9de911456b..231f191f5ed82 100644
--- a/tailnet/service.go
+++ b/tailnet/service.go
@@ -36,6 +36,14 @@ func WithStreamID(ctx context.Context, streamID StreamID) context.Context {
 	return context.WithValue(ctx, streamIDContextKey{}, streamID)
 }
 
+type ClientServiceOptions struct {
+	Logger                  slog.Logger
+	CoordPtr                *atomic.Pointer[Coordinator]
+	DERPMapUpdateFrequency  time.Duration
+	DERPMapFn               func() *tailcfg.DERPMap
+	NetworkTelemetryHandler func(batch []*proto.TelemetryEvent)
+}
+
 // ClientService is a tailnet coordination service that accepts a connection and version from a
 // tailnet client, and support versions 1.0 and 2.x of the Tailnet API protocol.
 type ClientService struct {
@@ -46,21 +54,17 @@ type ClientService struct {
 
 // NewClientService returns a ClientService based on the given Coordinator pointer.  The pointer is
 // loaded on each processed connection.
-func NewClientService(
-	logger slog.Logger,
-	coordPtr *atomic.Pointer[Coordinator],
-	derpMapUpdateFrequency time.Duration,
-	derpMapFn func() *tailcfg.DERPMap,
-) (
+func NewClientService(options ClientServiceOptions) (
 	*ClientService, error,
 ) {
-	s := &ClientService{Logger: logger, CoordPtr: coordPtr}
+	s := &ClientService{Logger: options.Logger, CoordPtr: options.CoordPtr}
 	mux := drpcmux.New()
 	drpcService := &DRPCService{
-		CoordPtr:               coordPtr,
-		Logger:                 logger,
-		DerpMapUpdateFrequency: derpMapUpdateFrequency,
-		DerpMapFn:              derpMapFn,
+		CoordPtr:                options.CoordPtr,
+		Logger:                  options.Logger,
+		DerpMapUpdateFrequency:  options.DERPMapUpdateFrequency,
+		DerpMapFn:               options.DERPMapFn,
+		NetworkTelemetryHandler: options.NetworkTelemetryHandler,
 	}
 	err := proto.DRPCRegisterTailnet(mux, drpcService)
 	if err != nil {
@@ -73,7 +77,7 @@ func NewClientService(
 				xerrors.Is(err, context.DeadlineExceeded) {
 				return
 			}
-			logger.Debug(context.Background(), "drpc server error", slog.Error(err))
+			options.Logger.Debug(context.Background(), "drpc server error", slog.Error(err))
 		},
 	})
 	s.drpc = server
@@ -117,99 +121,17 @@ func (s ClientService) ServeConnV2(ctx context.Context, conn net.Conn, streamID
 
 // DRPCService is the dRPC-based, version 2.x of the tailnet API and implements proto.DRPCClientServer
 type DRPCService struct {
-	CoordPtr                       *atomic.Pointer[Coordinator]
-	Logger                         slog.Logger
-	DerpMapUpdateFrequency         time.Duration
-	DerpMapFn                      func() *tailcfg.DERPMap
-	NetworkTelemetryBatchFrequency time.Duration
-	NetworkTelemetryBatchMaxSize   int
-	NetworkTelemetryBatchFn        func(batch []*proto.TelemetryEvent)
-
-	mu                      sync.Mutex
-	networkEventBatchTicker *time.Ticker
-	pendingNetworkEvents    []*proto.TelemetryEvent
-}
-
-func (s *DRPCService) writeTelemetryEvents(events []*proto.TelemetryEvent) {
-	if s.NetworkTelemetryBatchFn == nil {
-		return
-	}
-	s.NetworkTelemetryBatchFn(events)
-}
-
-func (s *DRPCService) sendTelemetryBatch() {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	events := s.pendingNetworkEvents
-	s.pendingNetworkEvents = []*proto.TelemetryEvent{}
-	go s.writeTelemetryEvents(events)
-}
-
-// PeriodicTelemetryBatcher starts a goroutine to periodically send telemetry
-// events to the telemetry backend. The returned function is a cleanup function
-// that should be called when the service is no longer needed. Calling this more
-// than once will panic.
-//
-// Note: calling the returned function does not unblock any in-flight calls to
-// the underlying telemetry backend that come from PostTelemetry due to
-// s.TelemetryBatchMaxSize.
-func (s *DRPCService) PeriodicTelemetryBatcher() func() {
-	var (
-		closed = make(chan struct{})
-		done   = make(chan struct{})
-	)
-	if s.NetworkTelemetryBatchFn == nil {
-		return func() {}
-	}
-
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	if s.networkEventBatchTicker != nil {
-		panic("PeriodicTelemetryBatcher called more than once")
-	}
-	ticker := time.NewTicker(s.NetworkTelemetryBatchFrequency)
-	s.networkEventBatchTicker = ticker
-
-	go func() {
-		defer close(done)
-		defer ticker.Stop()
-
-		for {
-			select {
-			case <-ticker.C:
-				s.sendTelemetryBatch()
-			case <-closed:
-				// Send any remaining telemetry events before exiting.
-				s.sendTelemetryBatch()
-				return
-			}
-		}
-	}()
-
-	return func() {
-		close(closed)
-		<-done
-	}
+	CoordPtr                *atomic.Pointer[Coordinator]
+	Logger                  slog.Logger
+	DerpMapUpdateFrequency  time.Duration
+	DerpMapFn               func() *tailcfg.DERPMap
+	NetworkTelemetryHandler func(batch []*proto.TelemetryEvent)
 }
 
 func (s *DRPCService) PostTelemetry(_ context.Context, req *proto.TelemetryRequest) (*proto.TelemetryResponse, error) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	for _, event := range req.Events {
-		s.pendingNetworkEvents = append(s.pendingNetworkEvents, event)
-
-		if len(s.pendingNetworkEvents) >= s.NetworkTelemetryBatchMaxSize {
-			events := s.pendingNetworkEvents
-			s.pendingNetworkEvents = []*proto.TelemetryEvent{}
-			// Perform the send in a goroutine to avoid blocking the DRPC call.
-			if s.networkEventBatchTicker != nil {
-				s.networkEventBatchTicker.Reset(s.NetworkTelemetryBatchFrequency)
-			}
-			go s.writeTelemetryEvents(events)
-		}
+	if s.NetworkTelemetryHandler != nil {
+		s.NetworkTelemetryHandler(req.Events)
 	}
-
 	return &proto.TelemetryResponse{}, nil
 }
 
@@ -315,3 +237,83 @@ func (c communicator) loopResp() {
 		}
 	}
 }
+
+type NetworkTelemetryBatcher struct {
+	frequency time.Duration
+	maxSize   int
+	batchFn   func(batch []*proto.TelemetryEvent)
+
+	mu      sync.Mutex
+	closed  chan struct{}
+	done    chan struct{}
+	ticker  *time.Ticker
+	pending []*proto.TelemetryEvent
+}
+
+func NewNetworkTelemetryBatcher(frequency time.Duration, maxSize int, batchFn func(batch []*proto.TelemetryEvent)) *NetworkTelemetryBatcher {
+	b := &NetworkTelemetryBatcher{
+		frequency: frequency,
+		maxSize:   maxSize,
+		batchFn:   batchFn,
+		closed:    make(chan struct{}),
+		done:      make(chan struct{}),
+	}
+	b.start()
+	return b
+}
+
+func (b *NetworkTelemetryBatcher) Close() error {
+	close(b.closed)
+	<-b.done
+	return nil
+}
+
+func (b *NetworkTelemetryBatcher) sendTelemetryBatch() {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	events := b.pending
+	b.pending = []*proto.TelemetryEvent{}
+	go b.batchFn(events)
+}
+
+func (b *NetworkTelemetryBatcher) start() {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	ticker := time.NewTicker(b.frequency)
+	b.ticker = ticker
+
+	go func() {
+		defer close(b.done)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ticker.C:
+				b.sendTelemetryBatch()
+			case <-b.closed:
+				// Send any remaining telemetry events before exiting.
+				b.sendTelemetryBatch()
+				return
+			}
+		}
+	}()
+}
+
+func (b *NetworkTelemetryBatcher) Handler(events []*proto.TelemetryEvent) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	for _, event := range events {
+		b.pending = append(b.pending, event)
+
+		if len(b.pending) >= b.maxSize {
+			events := b.pending
+			b.pending = []*proto.TelemetryEvent{}
+			// Perform the send in a goroutine to avoid blocking the DRPC call.
+			if b.ticker != nil {
+				b.ticker.Reset(b.frequency)
+			}
+			go b.batchFn(events)
+		}
+	}
+}
diff --git a/tailnet/service_test.go b/tailnet/service_test.go
index 572d5ad2d7030..ddc4a52b002f9 100644
--- a/tailnet/service_test.go
+++ b/tailnet/service_test.go
@@ -28,10 +28,13 @@ func TestClientService_ServeClient_V2(t *testing.T) {
 	coordPtr.Store(&coord)
 	logger := slogtest.Make(t, nil).Leveled(slog.LevelDebug)
 	derpMap := &tailcfg.DERPMap{Regions: map[int]*tailcfg.DERPRegion{999: {RegionCode: "test"}}}
-	uut, err := tailnet.NewClientService(
-		logger, &coordPtr,
-		time.Millisecond, func() *tailcfg.DERPMap { return derpMap },
-	)
+	uut, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  logger,
+		CoordPtr:                &coordPtr,
+		DERPMapUpdateFrequency:  time.Millisecond,
+		DERPMapFn:               func() *tailcfg.DERPMap { return derpMap },
+		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) {},
+	})
 	require.NoError(t, err)
 
 	ctx := testutil.Context(t, testutil.WaitShort)
@@ -96,6 +99,9 @@ func TestClientService_ServeClient_V2(t *testing.T) {
 	err = dms.Close()
 	require.NoError(t, err)
 
+	// PostTelemetry
+	// TODO: write test
+
 	// RPCs closed; we need to close the Conn to end the session.
 	err = c.Close()
 	require.NoError(t, err)
@@ -110,7 +116,13 @@ func TestClientService_ServeClient_V1(t *testing.T) {
 	coordPtr := atomic.Pointer[tailnet.Coordinator]{}
 	coordPtr.Store(&coord)
 	logger := slogtest.Make(t, nil).Leveled(slog.LevelDebug)
-	uut, err := tailnet.NewClientService(logger, &coordPtr, 0, nil)
+	uut, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                  logger,
+		CoordPtr:                &coordPtr,
+		DERPMapUpdateFrequency:  0,
+		DERPMapFn:               nil,
+		NetworkTelemetryHandler: nil,
+	})
 	require.NoError(t, err)
 
 	ctx := testutil.Context(t, testutil.WaitShort)
diff --git a/tailnet/test/integration/integration.go b/tailnet/test/integration/integration.go
index 938ed29e8d555..2f19ec43dec02 100644
--- a/tailnet/test/integration/integration.go
+++ b/tailnet/test/integration/integration.go
@@ -38,6 +38,7 @@ import (
 	"github.com/coder/coder/v2/coderd/tracing"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/tailnet"
+	tailnetproto "github.com/coder/coder/v2/tailnet/proto"
 	"github.com/coder/coder/v2/testutil"
 )
 
@@ -169,11 +170,17 @@ func (o SimpleServerOptions) Router(t *testing.T, logger slog.Logger) *chi.Mux {
 		conns: make(map[uuid.UUID]net.Conn),
 	}
 
-	csvc, err := tailnet.NewClientService(logger, &coordPtr, 10*time.Minute, func() *tailcfg.DERPMap {
-		return &tailcfg.DERPMap{
-			// Clients will set their own based on their custom access URL.
-			Regions: map[int]*tailcfg.DERPRegion{},
-		}
+	csvc, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
+		Logger:                 logger,
+		CoordPtr:               &coordPtr,
+		DERPMapUpdateFrequency: 10 * time.Minute,
+		DERPMapFn: func() *tailcfg.DERPMap {
+			return &tailcfg.DERPMap{
+				// Clients will set their own based on their custom access URL.
+				Regions: map[int]*tailcfg.DERPRegion{},
+			}
+		},
+		NetworkTelemetryHandler: func(batch []*tailnetproto.TelemetryEvent) {},
 	})
 	require.NoError(t, err)
 

From 479df1fd1255ffb63a1ed70c4e50e5dc119e76ee Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Fri, 28 Jun 2024 07:17:21 +0000
Subject: [PATCH 5/6] Tests

---
 coderd/coderd.go        |  2 +
 tailnet/service.go      |  9 +++--
 tailnet/service_test.go | 82 ++++++++++++++++++++++++++++++++++++++---
 3 files changed, 84 insertions(+), 9 deletions(-)

diff --git a/coderd/coderd.go b/coderd/coderd.go
index 02761d13a3646..7ff22634b1aa0 100644
--- a/coderd/coderd.go
+++ b/coderd/coderd.go
@@ -39,6 +39,7 @@ import (
 	"cdr.dev/slog"
 	agentproto "github.com/coder/coder/v2/agent/proto"
 	"github.com/coder/coder/v2/buildinfo"
+	"github.com/coder/coder/v2/clock"
 	_ "github.com/coder/coder/v2/coderd/apidoc" // Used for swagger docs.
 	"github.com/coder/coder/v2/coderd/appearance"
 	"github.com/coder/coder/v2/coderd/audit"
@@ -548,6 +549,7 @@ func New(options *Options) *API {
 		options.PrometheusRegistry.MustRegister(stn)
 	}
 	api.NetworkTelemetryBatcher = tailnet.NewNetworkTelemetryBatcher(
+		clock.NewReal(),
 		api.Options.NetworkTelemetryBatchFrequency,
 		api.Options.NetworkTelemetryBatchMaxSize,
 		api.handleNetworkTelemetry,
diff --git a/tailnet/service.go b/tailnet/service.go
index 231f191f5ed82..9ac086e850994 100644
--- a/tailnet/service.go
+++ b/tailnet/service.go
@@ -17,6 +17,7 @@ import (
 
 	"cdr.dev/slog"
 	"github.com/coder/coder/v2/apiversion"
+	"github.com/coder/coder/v2/clock"
 	"github.com/coder/coder/v2/tailnet/proto"
 )
 
@@ -239,6 +240,7 @@ func (c communicator) loopResp() {
 }
 
 type NetworkTelemetryBatcher struct {
+	clock     clock.Clock
 	frequency time.Duration
 	maxSize   int
 	batchFn   func(batch []*proto.TelemetryEvent)
@@ -246,12 +248,13 @@ type NetworkTelemetryBatcher struct {
 	mu      sync.Mutex
 	closed  chan struct{}
 	done    chan struct{}
-	ticker  *time.Ticker
+	ticker  *clock.Ticker
 	pending []*proto.TelemetryEvent
 }
 
-func NewNetworkTelemetryBatcher(frequency time.Duration, maxSize int, batchFn func(batch []*proto.TelemetryEvent)) *NetworkTelemetryBatcher {
+func NewNetworkTelemetryBatcher(clk clock.Clock, frequency time.Duration, maxSize int, batchFn func(batch []*proto.TelemetryEvent)) *NetworkTelemetryBatcher {
 	b := &NetworkTelemetryBatcher{
+		clock:     clk,
 		frequency: frequency,
 		maxSize:   maxSize,
 		batchFn:   batchFn,
@@ -279,7 +282,7 @@ func (b *NetworkTelemetryBatcher) sendTelemetryBatch() {
 func (b *NetworkTelemetryBatcher) start() {
 	b.mu.Lock()
 	defer b.mu.Unlock()
-	ticker := time.NewTicker(b.frequency)
+	ticker := b.clock.NewTicker(b.frequency)
 	b.ticker = ticker
 
 	go func() {
diff --git a/tailnet/service_test.go b/tailnet/service_test.go
index ddc4a52b002f9..0bbe9c20e6662 100644
--- a/tailnet/service_test.go
+++ b/tailnet/service_test.go
@@ -8,12 +8,14 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/xerrors"
 	"tailscale.com/tailcfg"
 
 	"cdr.dev/slog"
 	"cdr.dev/slog/sloggers/slogtest"
+	"github.com/coder/coder/v2/clock"
 	"github.com/coder/coder/v2/tailnet"
 	"github.com/coder/coder/v2/tailnet/proto"
 	"github.com/coder/coder/v2/tailnet/tailnettest"
@@ -28,12 +30,16 @@ func TestClientService_ServeClient_V2(t *testing.T) {
 	coordPtr.Store(&coord)
 	logger := slogtest.Make(t, nil).Leveled(slog.LevelDebug)
 	derpMap := &tailcfg.DERPMap{Regions: map[int]*tailcfg.DERPRegion{999: {RegionCode: "test"}}}
+
+	telemetryEvents := make(chan []*proto.TelemetryEvent, 64)
 	uut, err := tailnet.NewClientService(tailnet.ClientServiceOptions{
-		Logger:                  logger,
-		CoordPtr:                &coordPtr,
-		DERPMapUpdateFrequency:  time.Millisecond,
-		DERPMapFn:               func() *tailcfg.DERPMap { return derpMap },
-		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) {},
+		Logger:                 logger,
+		CoordPtr:               &coordPtr,
+		DERPMapUpdateFrequency: time.Millisecond,
+		DERPMapFn:              func() *tailcfg.DERPMap { return derpMap },
+		NetworkTelemetryHandler: func(batch []*proto.TelemetryEvent) {
+			telemetryEvents <- batch
+		},
 	})
 	require.NoError(t, err)
 
@@ -100,7 +106,23 @@ func TestClientService_ServeClient_V2(t *testing.T) {
 	require.NoError(t, err)
 
 	// PostTelemetry
-	// TODO: write test
+	telemetryReq := &proto.TelemetryRequest{
+		Events: []*proto.TelemetryEvent{
+			{
+				Id: []byte("hi"),
+			},
+			{
+				Id: []byte("bye"),
+			},
+		},
+	}
+	res, err := client.PostTelemetry(ctx, telemetryReq)
+	require.NoError(t, err)
+	require.NotNil(t, res)
+	gotEvents := testutil.RequireRecvCtx(ctx, t, telemetryEvents)
+	require.Len(t, gotEvents, 2)
+	require.Equal(t, "hi", string(gotEvents[0].Id))
+	require.Equal(t, "bye", string(gotEvents[1].Id))
 
 	// RPCs closed; we need to close the Conn to end the session.
 	err = c.Close()
@@ -154,3 +176,51 @@ func TestClientService_ServeClient_V1(t *testing.T) {
 	err = testutil.RequireRecvCtx(ctx, t, errCh)
 	require.ErrorIs(t, err, expectedError)
 }
+
+func TestNetworkTelemetryBatcher(t *testing.T) {
+	t.Parallel()
+
+	var (
+		events = make(chan []*proto.TelemetryEvent, 64)
+		mClock = clock.NewMock(t)
+		b      = tailnet.NewNetworkTelemetryBatcher(mClock, time.Millisecond, 3, func(batch []*proto.TelemetryEvent) {
+			assert.LessOrEqual(t, len(batch), 3)
+			events <- batch
+		})
+	)
+
+	b.Handler([]*proto.TelemetryEvent{
+		{Id: []byte("1")},
+		{Id: []byte("2")},
+	})
+	b.Handler([]*proto.TelemetryEvent{
+		{Id: []byte("3")},
+		{Id: []byte("4")},
+	})
+
+	// Should overflow and send a batch.
+	ctx := testutil.Context(t, testutil.WaitShort)
+	batch := testutil.RequireRecvCtx(ctx, t, events)
+	require.Len(t, batch, 3)
+	require.Equal(t, "1", string(batch[0].Id))
+	require.Equal(t, "2", string(batch[1].Id))
+	require.Equal(t, "3", string(batch[2].Id))
+
+	// Should send any pending events when the ticker fires.
+	mClock.Advance(time.Millisecond)
+	batch = testutil.RequireRecvCtx(ctx, t, events)
+	require.Len(t, batch, 1)
+	require.Equal(t, "4", string(batch[0].Id))
+
+	// Should send any pending events when closed.
+	b.Handler([]*proto.TelemetryEvent{
+		{Id: []byte("5")},
+		{Id: []byte("6")},
+	})
+	err := b.Close()
+	require.NoError(t, err)
+	batch = testutil.RequireRecvCtx(ctx, t, events)
+	require.Len(t, batch, 2)
+	require.Equal(t, "5", string(batch[0].Id))
+	require.Equal(t, "6", string(batch[1].Id))
+}

From 6a40a02280e8bda89b8d4ec06f6cf5e36422ef1d Mon Sep 17 00:00:00 2001
From: Dean Sheather <dean@deansheather.com>
Date: Mon, 1 Jul 2024 11:04:36 +0000
Subject: [PATCH 6/6] Comments

---
 coderd/coderd.go              |  7 +++++-
 coderd/telemetry/telemetry.go | 30 ++++++++++++++---------
 tailnet/service.go            | 45 +++++++++++++++++++++++++----------
 3 files changed, 58 insertions(+), 24 deletions(-)

diff --git a/coderd/coderd.go b/coderd/coderd.go
index 7ff22634b1aa0..f399801f67dd8 100644
--- a/coderd/coderd.go
+++ b/coderd/coderd.go
@@ -1330,7 +1330,12 @@ type API struct {
 
 // Close waits for all WebSocket connections to drain before returning.
 func (api *API) Close() error {
-	api.cancel()
+	select {
+	case <-api.ctx.Done():
+		return xerrors.New("API already closed")
+	default:
+		api.cancel()
+	}
 	if api.derpCloseFunc != nil {
 		api.derpCloseFunc()
 	}
diff --git a/coderd/telemetry/telemetry.go b/coderd/telemetry/telemetry.go
index e35475c4add71..3692d6eb5cbee 100644
--- a/coderd/telemetry/telemetry.go
+++ b/coderd/telemetry/telemetry.go
@@ -1249,12 +1249,12 @@ type NetworkEvent struct {
 	DERPMap             DERPMap                         `json:"derp_map"`
 	LatestNetcheck      Netcheck                        `json:"latest_netcheck"`
 
-	ConnectionAge   time.Duration `json:"connection_age"`
-	ConnectionSetup time.Duration `json:"connection_setup"`
-	P2PSetup        time.Duration `json:"p2p_setup"`
-	DERPLatency     time.Duration `json:"derp_latency"`
-	P2PLatency      time.Duration `json:"p2p_latency"`
-	ThroughputMbits *float32      `json:"throughput_mbits"`
+	ConnectionAge   *time.Duration `json:"connection_age"`
+	ConnectionSetup *time.Duration `json:"connection_setup"`
+	P2PSetup        *time.Duration `json:"p2p_setup"`
+	DERPLatency     *time.Duration `json:"derp_latency"`
+	P2PLatency      *time.Duration `json:"p2p_latency"`
+	ThroughputMbits *float32       `json:"throughput_mbits"`
 }
 
 func protoFloat(f *wrapperspb.FloatValue) *float32 {
@@ -1264,6 +1264,14 @@ func protoFloat(f *wrapperspb.FloatValue) *float32 {
 	return &f.Value
 }
 
+func protoDurationNil(d *durationpb.Duration) *time.Duration {
+	if d == nil {
+		return nil
+	}
+	dur := d.AsDuration()
+	return &dur
+}
+
 func NetworkEventFromProto(proto *tailnetproto.TelemetryEvent) (NetworkEvent, error) {
 	if proto == nil {
 		return NetworkEvent{}, xerrors.New("nil event")
@@ -1294,11 +1302,11 @@ func NetworkEventFromProto(proto *tailnetproto.TelemetryEvent) (NetworkEvent, er
 		DERPMap:             derpMapFromProto(proto.DerpMap),
 		LatestNetcheck:      netcheckFromProto(proto.LatestNetcheck),
 
-		ConnectionAge:   proto.ConnectionAge.AsDuration(),
-		ConnectionSetup: proto.ConnectionSetup.AsDuration(),
-		P2PSetup:        proto.P2PSetup.AsDuration(),
-		DERPLatency:     proto.DerpLatency.AsDuration(),
-		P2PLatency:      proto.P2PLatency.AsDuration(),
+		ConnectionAge:   protoDurationNil(proto.ConnectionAge),
+		ConnectionSetup: protoDurationNil(proto.ConnectionSetup),
+		P2PSetup:        protoDurationNil(proto.P2PSetup),
+		DERPLatency:     protoDurationNil(proto.DerpLatency),
+		P2PLatency:      protoDurationNil(proto.P2PLatency),
 		ThroughputMbits: protoFloat(proto.ThroughputMbits),
 	}, nil
 }
diff --git a/tailnet/service.go b/tailnet/service.go
index 9ac086e850994..d5842151ecb26 100644
--- a/tailnet/service.go
+++ b/tailnet/service.go
@@ -267,7 +267,13 @@ func NewNetworkTelemetryBatcher(clk clock.Clock, frequency time.Duration, maxSiz
 
 func (b *NetworkTelemetryBatcher) Close() error {
 	close(b.closed)
-	<-b.done
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	select {
+	case <-ctx.Done():
+		return xerrors.New("timed out waiting for batcher to close")
+	case <-b.done:
+	}
 	return nil
 }
 
@@ -275,24 +281,30 @@ func (b *NetworkTelemetryBatcher) sendTelemetryBatch() {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 	events := b.pending
+	if len(events) == 0 {
+		return
+	}
 	b.pending = []*proto.TelemetryEvent{}
-	go b.batchFn(events)
+	b.batchFn(events)
 }
 
 func (b *NetworkTelemetryBatcher) start() {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	ticker := b.clock.NewTicker(b.frequency)
-	b.ticker = ticker
+	b.ticker = b.clock.NewTicker(b.frequency)
 
 	go func() {
-		defer close(b.done)
-		defer ticker.Stop()
+		defer func() {
+			// The lock prevents Handler from racing with Close.
+			b.mu.Lock()
+			defer b.mu.Unlock()
+			close(b.done)
+			b.ticker.Stop()
+		}()
 
 		for {
 			select {
-			case <-ticker.C:
+			case <-b.ticker.C:
 				b.sendTelemetryBatch()
+				b.ticker.Reset(b.frequency)
 			case <-b.closed:
 				// Send any remaining telemetry events before exiting.
 				b.sendTelemetryBatch()
@@ -305,17 +317,26 @@ func (b *NetworkTelemetryBatcher) start() {
 func (b *NetworkTelemetryBatcher) Handler(events []*proto.TelemetryEvent) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
+	select {
+	case <-b.closed:
+		return
+	default:
+	}
 
 	for _, event := range events {
 		b.pending = append(b.pending, event)
 
 		if len(b.pending) >= b.maxSize {
+			// This can't call sendTelemetryBatch directly because we already
+			// hold the lock.
 			events := b.pending
 			b.pending = []*proto.TelemetryEvent{}
+			// Resetting the ticker is best effort. We don't care if the ticker
+			// has already fired or has a pending message, because the only risk
+			// is that we send two telemetry events in short succession (which
+			// is totally fine).
+			b.ticker.Reset(b.frequency)
 			// Perform the send in a goroutine to avoid blocking the DRPC call.
-			if b.ticker != nil {
-				b.ticker.Reset(b.frequency)
-			}
 			go b.batchFn(events)
 		}
 	}