rate()

Since 1.3.0

Calculate the rate of change of the counter. This is the simple rate, equal to the last value minus the first value, divided by the time elapsed, after accounting for resets.

Samples

Get the rate of change per id over the entire recorded interval.

SELECT
    id,
    rate(summary)
FROM (
    SELECT
        id,
        counter_agg(ts, val) AS summary
    FROM foo
    GROUP BY id
) t

Arguments

The syntax is:

rate(
    summary CounterSummary
) RETURNS DOUBLE PRECISION

Name	Type	Default	Required	Description
summary	CounterSummary	-	✔	A counter aggregate created using counter_agg

Returns

Column	Type	Description
rate	DOUBLE PRECISION	The rate of change of the counter