promql: arithmetic on durations #12318
Description
What did you do?
I was trying to retrieve specific metrics at yesterdays midnight (23:59:59) by using something like this:
some_custom_metric @ <timestamp>
while
(time() - (hour(vector(time())) * 60 * 60 + minute(vector(time())) * 60) - 60)
and
0+(time() - (hour(vector(time())) * 60 * 60 + minute(vector(time())) * 60) - 60)
returns an OK timestamp, but while trying to use it like
some_custom_metric @ (time() - (hour(vector(time())) * 60 * 60 + minute(vector(time())) * 60) - 60)
or
some_custom_metric @ 0+(time() - (hour(vector(time())) * 60 * 60 + minute(vector(time())) * 60) - 60)
I'm receiving these kinds of errors
Error executing query: 1:10: parse error: unexpected "(" in @, expected timestamp
or
Error executing query: 1:1: parse error: @ modifier must be preceded by an instant vector selector or range vector selector or a subquery
What did you expect to see?
Metric at a specific time.
What did you see instead? Under which circumstances?
Errors:
Error executing query: 1:10: parse error: unexpected "(" in @, expected timestamp
or
Error executing query: 1:1: parse error: @ modifier must be preceded by an instant vector selector or range vector selector or a subquery
System information
Prometheus in K8s via Helm (2.43.0)
Prometheus version
Version 2.43.0
Revision edfc3bcd025dd6fe296c167a14a216cab1e552ee
Branch HEAD
BuildUser root@8a0ee342e522
BuildDate 20230321-12:56:07
GoVersion go1.19.7
Prometheus configuration file
-Alertmanager version
-
Alertmanager configuration file
-Logs
-