The rate of change in the counter computed over the time period specified by the
bounds in the CounterSummary, extrapolating to the edges. It is an
extrapolated_delta divided by the duration in seconds.
The bounds must be specified for the
extrapolated_rate function to work. The
bounds can be provided in the
counter_agg call, or by using the
extrapolated_rate( summary CounterSummary, method TEXT ) RETURNS DOUBLE PRECISION
For more information about counter aggregation functions, see the hyperfunctions documentation.
|summary||CounterSummary||The input CounterSummary from a counter_agg call|
|method||TEXT||The extrapolation method to use. Not case-sensitive.|
Currently, the only allowed value of method is
prometheus, as we have only
implemented extrapolation following the Prometheus extrapolation protocol.
|extrapolated_rate||DOUBLE PRECISION||The per-second rate of change of the counter computed from the CounterSummary extrapolated to the bounds specified there.|
SELECT id, bucket, extrapolated_rate( with_bounds( summary, time_bucket_range('15 min'::interval, bucket) ) ) FROM ( SELECT id, time_bucket('15 min'::interval, ts) AS bucket, counter_agg(ts, val) AS summary FROM foo GROUP BY id, time_bucket('15 min'::interval, ts) ) t
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