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pct Metrics Operator

The pct operator calculates, at each timestamp, the nth percentile of values of the input series for each time interval. If grouping is specified, it calculates the specified percentile for each group.

Syntax

pct(DOUBLE) [by FIELD [, FIELD, ...]]

Where DOUBLE is floating point number between 0.0 and 100.0, both inclusive.

Examples

Return the 95th percentile of all input time series

This query calculates a single time series, where each plotted value is the 95th percentile of the MemoryUsed metric of the input time series for a timeslice.  

metric=MemoryUsed | pct(95.0)

Return time series with average metric value in 95th percentile by a field

This query is similar to the previous but it calculates the percentile of the MemoryUsed metric by a metric field, in this case, node. The query returns a time series for each node; each plotted point in a time series corresponds to the 95th percentile of all of the input time series with that node value, for a timeslice.

metric=MemoryUsed | pct(95.0) by node
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