Update environment variables for APM and Process (DataDog#8393)

ian28223 · web-flow · commit 003845dcca2d · 2020-08-28T11:16:30.000-04:00
* Update environment variables for APM and Process

dropping `_config` is inaccurate.
Logs Agent, as of this writing do, does not have anything specific and follows `DD_LOGS_CONFIG_*`

* fix bullets

* fix yaml indent

* yaml
diff --git a/content/en/agent/guide/environment-variables.md b/content/en/agent/guide/environment-variables.md
@@ -60,14 +60,36 @@ In general, use the following rules:
 
 ### Exceptions
 
-* For the collection Agents (APM, process, and logs), drop the `_config` in the option name, for example:
-    ```yaml
-      apm_config:
-        enabled: true
-      # DD_APM_ENABLED=true
-    ```
+- Not all `datadog.yaml` options are available with environment variables. Refer to [config.go][4] in the Datadog Agent GitHub repo. Options with environment variables start with `config.BindEnv*`.
 
-* Not all `datadog.yaml` options are available with environment variables. Refer to [config.go][4] in the Datadog Agent GitHub repo. Options with environment variables start with `config.BindEnv*`.
+- Component-specific environment variables not listed in [config.go][4] may also be supported.
+ 
+  - **APM Trace Agent**
+
+      - [Docker APM Agent Environment Variables][5]
+      - [trace-agent env.go][6]
+      - example
+
+          ```yaml
+             apm_config:
+                 enabled: true
+                 env: dev
+             # DD_APM_ENABLED=true
+             # DD_APM_ENV=dev
+          ```
+
+  - **Live Process Agent**
+
+      - [process-agent config.go][7]
+      - example
+
+          ```yaml
+             process_config:
+                 enabled: true
+                 process_dd_url: https://process.datadoghq.com
+             # DD_PROCESS_AGENT_ENABLED=true
+             # DD_PROCESS_AGENT_URL=https://process.datadoghq.com
+          ```
 
 ## Further Reading
 
@@ -77,3 +99,6 @@ In general, use the following rules:
 [2]: /getting_started/tagging/unified_service_tagging
 [3]: /agent/proxy/#environment-variables
 [4]: https://github.com/DataDog/datadog-agent/blob/master/pkg/config/config.go
+[5]: https://docs.datadoghq.com/agent/docker/apm/#docker-apm-agent-environment-variables
+[6]: https://github.com/DataDog/datadog-agent/blob/master/pkg/trace/config/env.go
+[7]: https://github.com/DataDog/datadog-agent/blob/master/pkg/process/config/config.go
