- Improved storage format makes downgrades impossible (breaking change).
- Added API endpoints for flags, dropped targets, and alert manager info; UI now shows annotations and snapshot options.
- Performance and reliability enhancements (federation, bearer token per scrape, discovery throttling) plus many bugfixes (TSDB, PromQL, Kubernetes SD, recursion stack overflow).
2.2.0 / 2018-03-08
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