extrapolated_rate()

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 with_bounds utility function.

extrapolated_rate(
    summary CounterSummary,
    method TEXT
) RETURNS DOUBLE PRECISION

For more information about counter aggregation functions, see the hyperfunctions documentation.

Required arguments

Currently, the only allowed value of method is prometheus, as we have only implemented extrapolation following the Prometheus extrapolation protocol.

Returns

Sample usage

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