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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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conf/frpc_full_example.toml
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@@ -79,9 +79,22 @@ webServer.password = "admin"
# Admin assets directory. By default, these assets are bundled with frpc.
# webServer.assetsDir = "./static"
# Deprecated: use metricsServer.pprofEnable for authenticated profiling.
# Enable golang pprof handlers in admin listener.
webServer.pprofEnable = false
# Separate health and optional profiling listener. frpc does not serve /metrics.
# Port 0 disables it. The default address only accepts local connections.
metricsServer.addr = "127.0.0.1"
metricsServer.port = 0
# Credentials and TLS are independent of webServer; /healthz stays anonymous.
# metricsServer.user = "monitor"
# metricsServer.password = "change-me"
# metricsServer.tls.certFile = "metrics.crt"
# metricsServer.tls.keyFile = "metrics.key"
# Profiling requires explicit opt-in, uses the above credentials, and excludes cmdline.
metricsServer.pprofEnable = false
# The maximum amount of time a dial to server will wait for a connect to complete. Default value is 10 seconds.
# transport.dialServerTimeout = 10