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vminsert: properly reset labels object on aggregation (#4278)

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Without reset, labels duplicates could have been added during stream aggregation.
Since `ctx.Labels` is reused during processing of many series, each series will
add its labels to the context. Even if the same labels were already addeded on prev
iteration. Now, we reset `ctx.Labels` on each iteration to contain so labels from
different series didn't interfere.

This could have cause exceeding of the limit on number of labels per pushed time series.

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4277

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2023-05-09 17:33:58 +02:00 committed by Aliaksandr Valialkin
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commit 81c5739529
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@ -65,6 +65,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* BUGFIX: [alerts-health](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/deployment/docker/alerts-health.yml): update threshold for `TooHighMemoryUsage` alert from 90% to 80%, since 90% is too high for production environments.
* BUGFIX: [vmbackup](https://docs.victoriametrics.com/vmbackup.html): fix compatibility with Windows OS. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/70).
* BUGFIX: [vmctl](https://docs.victoriametrics.com/vmctl.html): fix performance issue when migrating data from VictoriaMetrics according to [these docs](https://docs.victoriametrics.com/vmctl.html#migrating-data-from-victoriametrics). Add the ability to speed up the data migration via `--vm-native-disable-retries` command-line flag. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4092).
* BUGFIX: [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html): fix bug with duplicated labels during stream aggregation via single-node VictoriaMetrics. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4277).
## [v1.90.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.90.0)