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feat: add metricsServer for health checks, metrics and pprof (#5578)

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Add a separate HTTP listener for observability, configured through
metricsServer in both frps and frpc. It serves /healthz and, when
pprofEnable is set, the pprof handlers except /debug/pprof/cmdline. It
never serves the dashboard, static assets or the admin API, and it does
not touch the global assets filesystem.

frps also serves /metrics on this listener with both runtime and business
metrics, enabled by metricsServer.port alone. The in-memory collector
still starts only with the dashboard, and the Prometheus collector starts
either with metricsServer or with enablePrometheus plus webServer, so a
configuration that collected nothing before still collects nothing.

The /healthz, /metrics and pprof endpoints on webServer, and
enablePrometheus, keep working but are deprecated and log a hint at
startup. frpc does not serve /metrics yet.
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fatedier
2026-10-19 20:08:39 +08:00
committed by GitHub
parent 00e4fc4dd3
commit f13fdd58d4
20 changed files with 858 additions and 27 deletions
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Release.md
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@@ -2,6 +2,9 @@
* frpc can verify server certificates using system CAs, optionally combined with CAs from `trustedCaFile`.
* `frpc reload` now refreshes certificate files for unchanged `https2http` and `https2https` proxies without interrupting existing connections. Failed refreshes keep the previous certificate and report the error in proxy status and logs while reload still succeeds.
* Added `metricsServer` to both frps and frpc, a separate listener for health checks and optional profiling that does not expose the dashboard or the admin API. It is disabled unless `metricsServer.port` is set, defaults to `127.0.0.1`, and has its own credentials and TLS. In frps, setting the port also serves `/metrics` with both runtime and business metrics, so `enablePrometheus` is not needed there.
The `/healthz`, `/metrics` and pprof endpoints on `webServer`, and `enablePrometheus`, still work but are deprecated: configure `metricsServer` instead. They will be removed in a later release.
## Fixes