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docs: mention increase as alternative to rate

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit 0df506de54)
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hagen1778 2023-08-22 09:50:21 +02:00
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docs/stream-aggregation.md
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@ -451,6 +451,12 @@ For example, see below time series produced by config with aggregation interval
Aggregating irregular and sporadic metrics (received from [Lambdas](https://aws.amazon.com/lambda/)
or [Cloud Functions](https://cloud.google.com/functions)) can be controlled via [staleness_inteval](#stream-aggregation-config).
`increase` can be used as an alternative for [rate](https://docs.victoriametrics.com/MetricsQL.html#rate) function.
For example, if we have `increase` with `interval` of `5m` for a counter `some_counter`, then to get `rate` we should divide
the resulting aggregation by the `interval` in seconds: `some_counter:5m_increase / 300` is similar to `rate(some_counter[5m])`.
Please note, opposite to [rate](https://docs.victoriametrics.com/MetricsQL.html#rate), `increase` aggregations can be
combined safely afterwards. This is helpful when the aggregation is calculated by more than one vmagent.
### count_series
`count_series` counts the number of unique [time series](https://docs.victoriametrics.com/keyConcepts.html#time-series).