The possibility to extend Envoy metrics to emit custom-metrics in addition to the Envoy existing built-in metrics. about envoy HOT 2 CLOSED

there's some discussion of the stats architecture here: https://github.com/envoyproxy/envoy/blob/main/source/docs/stats.md

This is not really a how-to guide to add new stats but it might be a good start, as well as grepping around the source.

It also might be interesting to explore the codebase using the sourcegraph tool, e.g. with this as a starting point: https://sourcegraph.com/github.com/envoyproxy/envoy/-/blob/source/common/stats/utility.h?L95:16&popover=pinned

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Thanks Joshua for the links. I ended up using adding the metric using

scope_ = server_context_->scope().createScope("mymetric")
stats_ = {ALL_TCP_PROXY_STATS(POOL_COUNTER(*scope), POOL_GAUGE(*scope))};

from my extension and it worked. I think the important part is to keep the pointer to the created scope and the stat itself alive for the lifetime of the server since they seem to be a RefPointer.

Thanks,
Parsa

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