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Serve Prometheus metrics at /metrics behind basic auth (closes #94)
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With METRICS_USERNAME and METRICS_PASSWORD both set, the backend
records request metrics through go-http-metrics in a registry of its
own, with Go's runtime and process metrics, and serves them at
GET /metrics behind basic auth; nginx passes /metrics to it. With
neither set there is no such route; one alone, or a METRICS_USERNAME
containing ":", stops the start with an error naming the setting.

Only requests that reach the health check or POST /api/v1/reports are
recorded, as the labels are path and method, which clients could
otherwise make up without end; POST /api/v1/reports is registered by
its full path for that.

Deviation: go get and go mod tidy ran directly; no entrypoint added a Go
dependency yet (issue #45).

Model: opus-5-5
This commit was merged in pull request #103.
This commit is contained in:
clawbot
2026-10-04 04:58:47 +02:00
parent d412815953
commit 81d4153e78
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TODO.md
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@@ -23,6 +23,19 @@ latest run passes.
# Completed Steps
- 2026-10-04: the backend serves Prometheus metrics (issue #94). With
`METRICS_USERNAME` and `METRICS_PASSWORD` both set, it records request
duration and response size through `go-http-metrics` and serves them, with
Go's runtime and process metrics, at `GET /metrics` behind basic auth with
those credentials; nginx passes `/metrics` to it as it does `/api/`. With
neither set there are no metrics and `/metrics` is 404; one without the other
stops the start with an error naming both, and so does a `METRICS_USERNAME`
containing `:`, with an error naming it. Only requests that reach the health
check or `POST /api/v1/reports` are recorded, not `/metrics` itself and not
every request as `GO_HTTP_SERVER_CONVENTIONS.md` shows, because the labels are
the request's path and method, which clients can make up without end. For
that, `POST /api/v1/reports` is now registered by its full path instead of
inside a `/api/v1` route group; it answers as before
- 2026-10-04: `script/` and `Makefile` follow the org models (issue #28):
`make dev` shims to the new `script/dev`, the Vite dev server, and the new
`make build` to `script/build`, the frontend production build.