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docs: mention stream aggregation as more efficient approach for aggregation (#4429)

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2023-06-09 13:47:54 +02:00 committed by Aliaksandr Valialkin
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3
app/vmalert/README.md
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@ -526,6 +526,9 @@ Check how to replace it with [cluster VictoriaMetrics](#cluster-victoriametrics)
#### Downsampling and aggregation via vmalert
_Please note, [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html) might be more efficient
for cases when downsampling or aggregation need to be applied **before data gets into the TSDB.**_
`vmalert` can't modify existing data. But it can run arbitrary PromQL/MetricsQL queries
via [recording rules](#recording-rules) and backfill results to the configured `-remoteWrite.url`.
This ability allows to aggregate data. For example, the following rule will calculate the average value for

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docs/stream-aggregation.md
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@ -13,7 +13,7 @@ aliases:
# streaming aggregation
[vmagent](https://docs.victoriametrics.com/vmagent.html) and [single-node VictoriaMetrics](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html)
can aggregate incoming [samples](https://docs.victoriametrics.com/keyConcepts.html#raw-samples) in streaming mode by time and by labels.
can aggregate incoming [samples](https://docs.victoriametrics.com/keyConcepts.html#raw-samples) in streaming mode by time and by labels before data is written to remote storage.
The aggregation is applied to all the metrics received via any [supported data ingestion protocol](https://docs.victoriametrics.com/#how-to-import-time-series-data)
and/or scraped from [Prometheus-compatible targets](https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter).

3
docs/vmalert.md
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@ -537,6 +537,9 @@ Check how to replace it with [cluster VictoriaMetrics](#cluster-victoriametrics)
#### Downsampling and aggregation via vmalert
_Please note, [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html) might be more efficient
for cases when downsampling or aggregation need to be applied **before data gets into the TSDB.**_
`vmalert` can't modify existing data. But it can run arbitrary PromQL/MetricsQL queries
via [recording rules](#recording-rules) and backfill results to the configured `-remoteWrite.url`.
This ability allows to aggregate data. For example, the following rule will calculate the average value for