Reposting from the IRC chat: I have been running into an issue with dividing:
vector with one label by vector with different labels I understand that prometheus divides vectors via label matching. However, sometimes dividing by vectors with non-matching labels "makes sense" Take my particular use case: I am trying to integrate two exporters, process-exporter and node-exporter, correlating process memory metrics with node memory metrics. To calculate memory use, I divide a process' memory use by the total memory on the machine Node-exporter exposes this as node_memory_MemTotal_bytes Now this metric will never change, this is basically a "scalar" What is the proper way to divide the first vector by the second vector? The only real workaround I can get to work, is to put a dummy label on both metrics via label replace and divide them that way. But this is an extra calculation everytime I want to do this, for something that, in my case when integrating two exporters together, will happen a lot. For example, - record: procex_memory_megabytes_by_process expr: label_replace(procex_memory_megabytes_by_process, "dummy_label", "dummy_val", "", "") - record: node_memory_MemTotal_bytes expr: label_replace(node_cpu_seconds_total, "dummy_label", "dummy_val", "", "") # final metric - record: memory_usage_percentage expr: procex_memory_megabytes_by_process / ignoring(groupname) group_left node_memory_MemTotal_bytes I don't see anything in the docs mentioning this and have searched the issues but haven't found much. Any help is greatly appreciated! -- 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/f83cce66-5b0a-4b34-a840-e2faa575e5d3n%40googlegroups.com.
