Revert "tailcfg,etc: remove unused tailcfg.Node.KeepAlive field" #37
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This reverts commit 7b1c3df.
This brings back keep alives. The code is pretty small and pretty reasonable for us to maintain. Without keep alives, Tailscale will let the connection go idle. When network traffic happens again it will require another handshake which causes a slight delay, sometimes up to 5 seconds.
Updates coder/coder#9352