with_bounds()

Since 1.3.0

Add time bounds to an already-computed counter aggregate. Bounds are necessary to use extrapolation accessors on the aggregate.

Samples

Create a counter aggregate for each id and each 15-minute interval. Then add bounds to the counter aggregate, so you can calculate the extrapolated rate.

SELECT
    id,
    bucket,
    extrapolated_rate(
        with_bounds(
            summary,
            time_bucket_range('15 min'::interval, bucket)
        ),
        'prometheus'
    )
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

Arguments

The syntax is:

with_bounds(
    summary CounterSummary,
    bounds TSTZRANGE,
) RETURNS CounterSummary

Name	Type	Default	Required	Description
summary	CounterSummary	-	✔	A counter aggregate created using counter_agg
bounds	TSTZRANGE	-	✔	A range of timestamptz giving the smallest and largest allowed times in the counter aggregate

Returns

Column	Type	Description
with_bounds	CounterSummary	A new counter aggregate with the bounds applied