- Added a new /metadata API endpoint and enhanced remote read/write (query grouping, range hints, per‑queue bytes counter, and label renaming).
- Reduced TSDB memory usage and compaction buffering, improved replay latency, and now use WAL size for retention calculations.
- Fixed multiple bugs (alertmanager config, remote‑write shard gauge, rule evaluation label collisions, targets metadata handling) and removed deprecated discovery metrics.
2.15.0 / 2019-12-23
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