API

Prometheus exposes one HTTP API surface. This section covers the v1 routes, the federation endpoint, the remote write/read protocols, and the OTLP receiver.

Surface	Where to look
v1 JSON API	web/api/v1/api.go; routes under /api/v1/...
Remote write/read	storage/remote/; /api/v1/write, /api/v1/read
OTLP receiver	storage/remote/write_otlp_handler.go; /api/v1/otlp/v1/metrics
Federation	web/federate.go; /federate?match[]=...

The OpenAPI specification is generated programmatically and served at /openapi.yaml. The golden file is at web/api/v1/testdata/openapi.yaml and is enforced by web/api/v1/openapi_golden_test.go.