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docs/MetricsQL.md: clarify documentation for lifetime function

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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1780
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Aliaksandr Valialkin 2021-11-08 12:35:15 +02:00
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@ -204,7 +204,7 @@ See also [implicit query conversions](#implicit-query-conversions).
#### lifetime
`lifetime(series_selector[d])` calculates the lifetime in seconds per each time series returned from the given [series_selector](https://prometheus.io/docs/prometheus/latest/querying/basics/#time-series-selectors). The returned lifetime is limited by the given lookbehind window `d`. Metric names are stripped from the resulting rollups. See also [lag](#lag).
`lifetime(series_selector[d])` returns the duration in seconds between the last and the first sample on the given lookbehind window `d` per each time series returned from the given [series_selector](https://prometheus.io/docs/prometheus/latest/querying/basics/#time-series-selectors). Metric names are stripped from the resulting rollups. See also [lag](#lag).
#### max_over_time