- Changed WAL record format for experimental native histograms, breaking compatibility – upgrade requires removing the WAL directory to avoid data loss.
- Added native histogram support across the stack (agent, recording rules, federation, gauge and float histograms) and introduced a ‘keep firing for’ field in alerting rules.
- Extended Promtool with timeseries selection for TSDB dumps and added SD meta‑labels (container ID for Kubernetes pods, VM size for Azure).
2.42.0 / 2023-01-31
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