- Native Histograms are now GA – the experimental flag is removed and collection is enabled via the new `scrape_native_histograms` config option (breaking change for flag users).
- Added `/api/v1/features` endpoint to expose supported server features and several new Promtool and UI capabilities (duplicate query panel, start‑timestamp for tests, series‑JSON output).
- Numerous bug fixes across PromQL, UI autocomplete, TSDB handling, remote write/read, and OTLP receiver, plus performance tweaks and minor feature enhancements.
3.9.0 / 2026-01-06
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Deprecate non‑true/all values for the stats query parameter on /api/v1/query and /api/v1/query_range, now returning a warning and slated for removal in the next major release.
Updated golang.org/x/text to v0.39.0 and google.golang.org/grpc to v1.82.1, fixing CVE‑2026‑56852 and GHSA‑hrxh‑6v49‑42gf.