I have a counter, for example, user_actions with label user_id. I want to get alert, when user_actions is disappeared for any user_id.
Literally, I need absent_over_time(user_actions[60m]), but taking into account user_id label.
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Denis
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I couldn't come up with PromQL solution for this task, but it can be implemented with lag() function from MetricsQL. For instance, the following query would return all the user_actions time series that have no data points during the last 5 minutes (see 5*60 in the query). The query stops noticing such time series after 60 minutes (see 60m in square brackets):
lag(user_actions[60m]) > 5*60
See more details about lag() function in MetricsQL docs.
valyala
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am I right, that I cannot use this solution in Prometheus, but instead I should use VictoriaMetrics? – Denis Aug 16 '20 at 11:12
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Correct - Prometheus doesn't support `lag` function yet – valyala Aug 16 '20 at 11:37
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I see, thank you. VictoriaMetrics is a great project, but right now I have Prometheus :( – Denis Aug 16 '20 at 17:52