Handling promql queries over fields with varied labels

[Chris Bonnell]

I've looked through the backlog here and I can't find any questions that seem to match this one.

I'm trying to figure out if there's a way to aggregate fields with either different labels associated, or different sets of labels associated with them. If a query to, say, sum two different fields is executed and they don't precisely share labels, then nothing is found. I see the logic behind this behavior (so you can't, for example, add a gauge and a histogram), but I do wonder if it can be circumvented, and if so, how?

Does one need to implement relabeling rules manually for all such fields before attempting such an operation?

Thanks!
Chris

[Julius Volz]

I'm not sure if I understand your question - by aggregation, I guess you don't mean the sum() aggregator, as that allows you to sum across series with wildly different label sets.

Are you talking about binary operations like "a + b"? In that case, vector matching modifiers will help: https://prometheus.io/docs/querying/operators/#vector-matching

See also the section about that in a tutorial I wrote: https://www.digitalocean.com/community/tutorials/how-to-query-prometheus-on-ubuntu-14-04-part-1#step-7-—-performing-arithmetic

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