- Added native histogram support across UI, PromQL (avg function), and latency metrics, plus relabel rules for AlertManagerConfig routing.
- Introduced optional "dedupelabels" build tag for memory reduction and experimental timestamp alignment; performance enhancements for API, scraping, remote write, and OpenTelemetry parsing.
- Fixed bugs affecting rate() extrapolation, remote‑write WAL slowdown, range‑vector @ scoping, Kubernetes and Azure service discovery, AWS sigv4 signing, and exemplar trace ID labeling.
2.51.0 / 2024-03-18
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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.
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