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lib/netutil: limit the number of concurrently established connections when calling ConnPool.Get()

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This should reduce potential spikes in the number of established connections in the following cases:
- when the connection establishing procedure becomes temporarily slow
- after a temporary spike in the rate of ConnPool.Get() calls

See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2552
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Aliaksandr Valialkin 2022-05-11 14:11:03 +03:00
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@ -18,6 +18,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* FEATURE: [vmctl](https://docs.victoriametrics.com/vmctl.html): add `influx-prometheus-mode` command-line flag, which allows to restore the original time series written from Prometheus into InfluxDB during data migration from InfluxDB to VictoriaMetrics. See [this feature request](https://github.com/VictoriaMetrics/vmctl/issues/8). Thanks to @mback2k for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/2545).
* BUGFIX: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): do not return values from [label_value()](https://docs.victoriametrics.com/MetricsQL.html#label_value) function if the original time series has no values at the selected timestamps.
* BUGFIX: [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html): limit the number of concurrently established connections from vmselect to vmstorage. This should prevent from potentially high spikes in the number of established connections after temporary slowdown in connection handshake procedure between vmselect and vmstorage because of spikes in workload. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2552).
## [v1.77.1](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.77.1)