The instantaneous change in the counter at the left (earlier) and right (later) side of the time range.

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

The instantaneous change in the counter at the left (earlier) side of the time range. Essentially, the first value subtracted from the second value seen in the time range (handling resets appropriately). This can be especially useful for fast moving counters.

idelta_left(
summary CounterSummary
) RETURNS DOUBLE PRECISION
NameTypeDescription
summaryCounterSummaryThe input CounterSummary from a counter_agg call
NameTypeDescription
idelta_leftDOUBLE PRECISIONThe instantaneous delta computed from the left (earlier) side of the CounterSummary
SELECT
id,
bucket,
idelta_left(summary)
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

The instantaneous change in the counter at the right (later) side of the time range. Essentially, the penultimate value subtracted from the last value seen in the time range (handling resets appropriately). This can be especially useful for fast moving counters.

idelta_right(
summary CounterSummary
) RETURNS DOUBLE PRECISION
NameTypeDescription
summaryCounterSummaryThe input CounterSummary from a counter_agg call
NameTypeDescription
idelta_rightDOUBLE PRECISIONThe instantaneous delta computed from the right (later) side of the CounterSummary
SELECT
id,
bucket,
idelta_right(summary)
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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