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lib/storage/downsampling: handle dedup separately from downsampling rules with filters

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Previously, dedup was added as a downsampling rule with 0s offset to all downsmapling rules with filters. That enforced a metric name lookup even in cases it is not needed.
For example, the following configuration: `-dedup.minScrapeInterval=10s -downsampling.period={__name__=~"node.*"}:1h:1m` would be parsed as: `{__name__=~"node.*"}:1h:1m {}:0s:10s`

This commit changes this logic and treats dedup as a separate case. This allows to perform metric name lookups only in cases when timestamp of current partition can be eligible to use some of downsampling filters. Newer parts will not trigger metric name lookup and will apply deduplication directly.

Related issue:
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7440
---------
Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
Co-authored-by: f41gh7 <nik@victoriametrics.com>
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Zakhar Bessarab 2024-11-15 13:39:00 -03:00 committed by f41gh7
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@ -24,6 +24,7 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
* BUGFIX: [vmsingle](https://docs.victoriametrics.com/single-server-victoriametrics/), `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): keep the order of resulting time series when `limit_offset` is applied. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7068).
* BUGFIX: [graphite](https://docs.victoriametrics.com/#graphite-render-api-usage): properly handle xFilesFactor=0 for `transformRemoveEmptySeries` function. See [this PR](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/7337) for details.
* BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth): properly check availability of all the backends before giving up when proxying requests. Previously, vmauth could return an error even if there were healthy backends available. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3061) for details.
* BUGFIX: [Single-node VictoriaMetrics](https://docs.victoriametrics.com/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): Optimize resources usage for configured [downsampling](https://docs.victoriametrics.com/#downsampling) with time-series filter. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7440) for details.
* BUGFIX: `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): Properly return query results for search requests after index rotation. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7417) for details.
* BUGFIX: `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): Properly handle [multitenant](https://docs.victoriametrics.com/cluster-victoriametrics/#multitenancy-via-labels) query request errors and correctly perform search for available tenants. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7549) for details.