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Add HTTP method as a Prometheus metric label in Envoy
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Description

Currently we don't have per-method insight into requests in Envoy. This need this information to properly break down requests for SLA purposes, so we need to add it as a metric label for the various counters that Envoy accumulates for HTTP requests.

More related information available in https://gerrit.wikimedia.org/r/c/operations/deployment-charts/+/682921 for the workaround we are currently pursuing.