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docs: mention stream aggregation in churn rate section

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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docs/FAQ.md
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@ -338,7 +338,8 @@ The main reason for high churn rate is a metric label with frequently changed va
* A `hash` or `uuid` label, which changes frequently.
The solution against high churn rate is to identify and eliminate labels with frequently changed values.
[Cardinality explorer](https://docs.victoriametrics.com/#cardinality-explorer) can help determining these labels.
[Cardinality explorer](https://docs.victoriametrics.com/#cardinality-explorer) can help determining these labels. If labels can't be removed, try pre-aggregating data
before it gets ingested into database with [stream aggregation](https://docs.victoriametrics.com/stream-aggregation/).
The official Grafana dashboards for VictoriaMetrics contain graphs for churn rate - see [these docs](https://docs.victoriametrics.com/#monitoring) for details.