- Add experimental PromQL info function, support UTF‑8 label names, and enable custom HTTP headers in scraping configs.
- Introduce Google Cloud Monitoring auth for remote write and allow promotion of resource attributes to series labels in OTLP receiver.
- Fix multiple bugs: stable sort‑by‑label, target dropping/stale handling, duplicate label error handling in remote write, and exemplar dropping in scraping.
2.55.0 / 2024-10-22
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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.