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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.
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@@ -6,6 +6,21 @@ For the version compatibility policy that bounds these support windows, see the
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## Active
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### Observability endpoints on `webServer`
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- **Deprecated since:** v0.72.0 (when `metricsServer` was added).
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- **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.
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- **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.
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- **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.
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- **Code references:**
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- `server/api_router.go` — `/healthz`, and `/metrics` when `enablePrometheus` is set.
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- `client/api_router.go` — `/healthz`.
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- `pkg/util/http/server.go` — pprof handlers registered when `webServer.pprofEnable` is set.
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- `server/service.go` — startup deprecation warnings and `metricsCollectors`.
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- `client/service.go` — startup deprecation warnings.
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- `pkg/config/v1/server.go` — `EnablePrometheus`; `pkg/config/v1/common.go` — `WebServerConfig.PprofEnable`.
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- **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.
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### Wire protocol v1
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- **Deprecated since:** v0.70.0 (planned, when v2 becomes the default).
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