- Added memory‑mapped TSDB head block, reducing memory usage and speeding restarts (feature, always enabled).
- Various enhancements: Triton global‑zone discovery, longer alert resend delay, remote‑read query counter, time‑range parameters for label APIs, and reduced TSDB contention.
- Bug fixes for PromQL duplicate label handling, correct sample counting, NaN on empty histogram buckets, UI tab behavior, and TSDB query results with remote reads.
2.19.0 / 2020-06-09
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