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docs/CHANGELOG.md: document performance improvements when registering new time series

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Aliaksandr Valialkin 2022-03-03 17:11:30 +02:00
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@ -33,6 +33,7 @@ This rule is equivalent to less clear traditional one:
* FEATURE: reduce memory usage for various caches under [high churn rate](https://docs.victoriametrics.com/FAQ.html#what-is-high-churn-rate).
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): re-use Kafka client when pushing data from [many tenants](https://docs.victoriametrics.com/vmagent.html#multitenancy) to Kafka. Previously a separate Kafka client was created per each tenant. This could lead to increased load on Kafka. See [how to push data from vmagent to Kafka](https://docs.victoriametrics.com/vmagent.html#writing-metrics-to-kafka).
* FEATURE: improve performance when registering new time series. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2247). Thanks to @ahfuzhang .
* BUGFIX: return the proper number of datapoints from `moving*()` functions such as `movingAverage()` in [Graphite Render API](https://docs.victoriametrics.com/#graphite-render-api-usage). Previously these functions could return too big number of samples if [maxDataPoints query arg](https://graphite.readthedocs.io/en/stable/render_api.html#maxdatapoints) is explicitly passed to `/render` API.
* BUGFIX: properly handle [series selector](https://prometheus.io/docs/prometheus/latest/querying/basics/#time-series-selectors) containing a filter for multiple metric names plus a negative filter. For example, `{__name__=~"foo|bar",job!="baz"}` . Previously VictoriaMetrics could return series with `foo` or `bar` names and with `job="baz"`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2238).