> How do you deal with dynamic label names without having to create separate metrics counters?
You have to have separate counters. Every combination of (metric name + set of label names/values) creates a distinct timeries, i.e. a different metric, by definition. Therefore you need different counters for each distinct combination of label values. Labels are not just somewhere to store a string. If you put high-cardinality values in a label, i.e. values which change from request to request and are not bounded to a small subset of values, then you will risk a "cardinality explosion" where you have millions of timeseries all with a single value. Under these conditions, Prometheus will crash and burn. In your case, if you're using controller name and action name for labels, then I think it should be OK as those are values chosen from a small set defined in code. For counting requests which don't have these fields, then use a dummy value like "-" for those labels. On Monday, 15 August 2022 at 22:34:16 UTC+1 [email protected] wrote: > In the default metrics exported with app.usehttpmetrics(), certain > metrics, such as http_requests_received_total will have scraped data that > only contain ''code' and 'method' labels which I see is defined here in > HttpRequestLabelNames.cs > <https://github.com/prometheus-net/prometheus-net/blob/38d45fa0a102e9afc76f031675aa0719d4f063d1/Prometheus.AspNetCore/HttpMetrics/HttpRequestLabelNames.cs>. > > I'm trying to replicate the same thing with custom middleware that records > the response body content length. But when requests with bad query params > return 404 responses there is no controller, endpoint, or action fields in > HttpContext and I can't use my custom counters with those label names > specified. How do you deal with dynamic label names without having to > create separate metrics counters? -- 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/480cdc2e-825e-4c2c-94d5-c2a6cd8fe586n%40googlegroups.com.
