docs/CHANGELOG.md: document the bugfix in increase_pure() function from the commit fb4f758715

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Aliaksandr Valialkin 2021-06-24 12:05:39 +03:00
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* BUGFIX: vmstorage: reduce high disk write IO usage on systems with big number of CPU cores. The issue has been introduced in the release [v1.59.0](#v1590). See [this commit](aa9b56a046b6ae8083fa659df35dd5e994bf9115) and [this comment](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1338#issuecomment-863046999) for details.
* BUGFIX: vmstorage: prevent from incorrect stats collection when multiple concurrent queries execute the same tag filter. This may help reducing CPU usage under certain workloads. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1338).
* BUGFIX: vmselect: return the last timestamp for the max / min value from `tmax_over_time(m[d])` and `tmin_over_time(m[d])` [MetricsQL functions](https://docs.victoriametrics.com/MetricsQL.html) as most users expect. See also [this issue](https://github.com/prometheus/prometheus/issues/8966).
* BUGFIX: vmselect: return the expected value for `increase_pure()` [MetricsQL function](https://docs.victoriametrics.com/MetricsQL.html) after a gap in a time series. Previously incorrect too big value could be returned after the gap from `increase_pure()`.
## [v1.61.1](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.61.1)