Features

These are cross-cutting capabilities that span multiple subsystems. Each is implemented across cmd/prometheus/main.go, the relevant managers, and the storage/protocol layers.

Feature	Where it lives
Agent mode	tsdb/agent/, cmd/prometheus/main.go, web/
Native histograms	model/histogram/, tsdb/chunkenc/, promql/
Remote write	storage/remote/
Remote read	storage/remote/read*.go, web/api/v1/api.go
OTLP ingestion	storage/remote/write_otlp_handler.go, storage/remote/otlptranslator/
Exemplars	tsdb/exemplar.go, model/exemplar, web/api/v1/api.go
Feature flags	util/features/, --enable-feature CLI flag

For per-release status (experimental, beta, GA, deprecated), see docs/feature_flags.md and docs/stability.md.