rate()

Calculate the rate of change from a gauge aggregate

Early access Since 1.6.0

Calculate the rate of change of the gauge. This is the simple rate, equal to the last value minus the first value, divided by the time elapsed.

Samples

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

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

Arguments

The syntax is:

rate(
    summary GaugeSummary
) RETURNS DOUBLE PRECISION

Name	Type	Default	Required	Description
summary	GaugeSummary	-	✔	A gauge aggregate created using gauge_agg

Returns

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