Thanks for the reply. I still have one small follow up question regarding "Answer to 2": My question is in the context where I do NOT have another Prometheus on the client side to fetch with Federation, I just have an independant HTTP client that uses the remote HTTP API of Prometheus to fetch the metrics.
*Follow-up Question:* In this context, can my HTTP client use one HTTP request to fetch two different metrics at once or that is not possible? Thanks a lot! On Thursday, 12 March 2020 04:43:14 UTC-4, Brian Candler wrote: > > On Wednesday, 11 March 2020 22:38:11 UTC, Hakim Kahlouche wrote: >> >> Thanks for your reply. >> >> My question is about the PromQL calculation on metrics. >> >> Let's say I want to query the following: >> >> curl ' >> http://192.168.56.103:9090/api/v1/query?query=go_memstats_gc_cpu_fraction >> ' >> curl ' >> http://192.168.56.103:9090/api/v1/query?query=node_cpu_seconds_total' >> >> Can I send one HTTP request only to fetch both metrics? That means, I >> would receive a JSON with two time-series. >> >> Is that possible? >> > > You seem to be asking two different questions: > > 1. Can I use promQL to perform calculations between two different metrics? > 2. Can I fetch two different metrics at once, and perform my own > calculations on the raw data? > > Answer to 1 is "yes". The easiest calculations are between time series > which have exactly the same set of labels, but you can do more > sophisticated queries which match metrics based on subsets of labels. > > Answer to 2 is "yes", but as already said, you'd normally not use the > "query" endpoint for this, you'd be better using the "federate" endpoint > which can explicitly filter to the set of metrics you're interested in. > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/e169cf50-1825-41b4-9e74-24a2391b40e2%40googlegroups.com.
