How to Join two series in Prometheous using operator +

Question

Technically, Prometheus doesn’t have the concept of joining series like SQL, for example, has. However, series can be combined in Prometheus by using an operator on them

Series A

sum(rate(rpc_request_duration_seconds_bucket{instance=~"10.43.1.244"}[1m]))

Series B

sum(rate(rpc_request_duration_seconds_bucket{instance=~"10.43.1.245"}[1m]))

What is the best way to Join these two series uning prometheous

Does this answer your question? [How can I 'join' two metrics in a Prometheus query?](https://stackoverflow.com/questions/44461801/how-can-i-join-two-metrics-in-a-prometheus-query) — kaios, Apr 15 '22 at 08:33

score 1 · Answer 1 · answered Apr 22 '22 at 06:46

1

These are the same metrics. Why would you use join? You can use aggregation sum like you did and filter using regex.

Something like this (I didn't test the regex)

sum(rate(rpc_request_duration_seconds_bucket{instance=~"10\.43\.1\.24[45]"}[1m]))

answered Apr 22 '22 at 06:46

Sergio Santiago

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How to Join two series in Prometheous using operator +

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