Add Labels to exposed metrics (Question)

[fbalicchia]

Hi,
I'd like to know if possible to add labels to metrics exposed with go-sdk. At the moment of writing, I saw that is possible to add only the key but probably I'm misunderstanding something.
Thanks for help

[fbalicchia]

Ops sorry just see this issue proxy-wasm/proxy-wasm-cpp-sdk#130

[mathetake]

Hi @fbalicchia, "tags" are not directly supported in the Wasm ABI and there's several reasons for this (one is Envoy's internal API doesn't support dynamic tags). That means this is not the Go SDK specific issue, and you cannot define tags with any language SDK.

However you can "extract" tags from the name of metrics by configuring Envoy's StatsConfig.stats_tags(https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/metrics/v3/stats.proto#config-metrics-v3-statsconfig) properly. This is exactly what Istio does where the expose prometheus metrics with their custom tags.

[fbalicchia]

thanks, @mathetake for explanation

[mathetake]

I hope this #246 clarify your question!

[fbalicchia]

@mathetake yes thanks