- Enabled TSDB WAL compression by default, making downgrade to v2.10 or earlier require the explicit no‑storage.tsdb.wal‑compression flag (breaking change).
- Added new PromQL group() aggregator and expanded service discovery with Docker Swarm, DigitalOcean, and OpenStack support (features).
- Fixed many bugs and improved performance in remote read/write, TSDB, PromQL, UI and promtool (bugfix/minor).
2.20.0 / 2020-07-22
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