- Added an `enable feature=` flag exposing experimental capabilities: remote‑write receiver API and PromQL “@ <timestamp>” modifier.
- Implemented several enhancements such as optional testgroup naming, UI warnings, TSDB bucket and retention improvements, custom remote‑write headers, Kubernetes SD endpoint labels, and UI display of total label‑pair count.
- Fixed multiple bugs including global URL handling, backfill errors, remote‑write garbage collection and logging, TSDB temporary block cleanup, UI duplicate keys and label‑name leaks, and deprecated the unused `alertmanager.timeout` flag.
2.25.0 / 2021-02-17
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