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Document more source types #609

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b429ed8
Document HEALTH
jorbaum Feb 16, 2026
f8575c1
Document SYS source type
jorbaum Feb 16, 2026
5b069d2
Document PROXY
jorbaum Mar 10, 2026
8469f39
Clean up docs about SYS log type
chombium Aug 6, 2026
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14 changes: 14 additions & 0 deletions deploy-apps/streaming-logs.html.md.erb
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Expand Up @@ -149,6 +149,20 @@ For example:
2016-06-14T13:44:38.14-0700 [CELL/0] OUT Successfully created container
</pre>

### <a id='health'></a> HEALTH

The Diego Cell emits `HEALTH` logs when running health check actions for an app. These logs are generated by the health check binary that monitors app instances. By default, health check log output is suppressed unless an error occurs.

### <a id='proxy'></a> PROXY

Every app container includes an Envoy sidecar proxy that handles the mTLS handshake with the Gorouter and proxies traffic to the app process. The Envoy sidecar emits `PROXY` logs. By default, Envoy runs with a critical log level, so `PROXY` logs mainly appear when Envoy encounters critical errors, fails to start, or is killed due to the container running out of memory.

For example:

<pre class="terminal">
2026-01-26T13:49:18.72+0000 [PROXY/0] OUT Exit status 137 (out of memory)
</pre>


## <a id='writing'></a> Writing to the log from your app

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