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docs: added information about difference between default_rollup and last_over_time (#6282)

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https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6279
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Andrii Chubatiuk 2024-05-17 15:33:22 +03:00 committed by hagen1778
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docs/MetricsQL.md
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@ -328,6 +328,7 @@ See also [increases_over_time](#increases_over_time).
`default_rollup(series_selector[d])` is a [rollup function](#rollup-functions), which returns the last [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
value on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
Compared to [last_over_time](last_over_time) it accounts for [staleness markers](https://docs.victoriametrics.com/vmagent/#prometheus-staleness-markers) to detect stale series.
If the lookbehind window is skipped in square brackets, then it is automatically calculated as `max(step, scrape_interval)`, where `step` is the query arg value
passed to [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query) or [/api/v1/query](https://docs.victoriametrics.com/keyconcepts/#instant-query),