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fatedierandGitHub a73e8a14fc docs: track deprecated observability endpoints on webServer (#5582 )

Record the deprecation of the observability endpoints on webServer in
doc/deprecations.md, so the removal target is in one place next to the
other active deprecations.

The webServer /healthz, the frps webServer /metrics with its top-level
enablePrometheus switch, and the pprof handlers with webServer.pprofEnable
are deprecated since v0.72.0, when metricsServer was added. They are
replaced by metricsServer, whose /healthz, /metrics and pprofEnable are
independent of the dashboard listener.

2026-10-20 16:51:31 +08:00

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Deprecations

This document tracks deprecated features and APIs that are still shipped but scheduled for removal. Maintainers should review this list before each release to decide whether any items are due for removal.

For the version compatibility policy that bounds these support windows, see the latest Release.md.

Active

Observability endpoints on `webServer`

Deprecated since: v0.72.0 (when metricsServer was added).
Removal target: v0.80.0 or later. v0.71.x is the last line without metricsServer and is supported until v0.80.0 is released, so v0.79.x is the last release that must keep these endpoints.
Replacement: metricsServer. Point health probes at its /healthz, scrapes at its /metrics (frps exposes business metrics there without enablePrometheus), and use metricsServer.pprofEnable for profiling.
Deprecated items: /healthz on webServer in both frps and frpc; /metrics on the frps webServer and the top-level enablePrometheus that gates it; the pprof handlers on webServer and webServer.pprofEnable in both frps and frpc.
Code references:
- server/api_router.go — /healthz, and /metrics when enablePrometheus is set.
- client/api_router.go — /healthz.
- pkg/util/http/server.go — pprof handlers registered when webServer.pprofEnable is set.
- server/service.go — startup deprecation warnings and metricsCollectors.
- client/service.go — startup deprecation warnings.
- pkg/config/v1/server.go — EnablePrometheus; pkg/config/v1/common.go — WebServerConfig.PprofEnable.
Notes: Removal drops the startup warnings and the deprecation notes in README.md and the two conf/*_full_example.toml files together. webServer then serves only the dashboard and the admin API.

Wire protocol v1

Deprecated since: v0.70.0 (planned, when v2 becomes the default).
Removal target: v0.78.0 or later. v0.69.0 (the last release where v1 is the default) is supported until v0.78.0 is released, so v0.77.0 is the last release that must keep v1 support.
Replacement: wire protocol v2 (transport.wireProtocol = "v2" in frpc).
Code references: v1 message types and codec under pkg/msg/ and the protocol negotiation path in client/ and server/.
Notes: Removing v1 will also drop compatibility with any frpc/frps that does not negotiate v2.

INI configuration format

Deprecated since: predates this document; startup warning has been in place for several releases.
Removal target: TBD.
Replacement: YAML / JSON / TOML.
Code references:
- cmd/frpc/sub/root.go — frpc startup warning.
- cmd/frps/root.go — frps startup warning.
- pkg/config/legacy/ — legacy INI parser; remove together with the warnings.

Visitor connections without `runID`

Deprecated since: v0.50.0 (when runID was introduced).
Removal target: TBD.
Replacement: require runID on every visitor connection.
Code references:
- server/service.go — RegisterVisitorConn still accepts empty runID for backward compatibility.
Notes: Removal will break frpc clients released before v0.50.0. Schedule for a release where dropping pre-v0.50.0 frpc is acceptable.

Removed

None yet.

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