Get Envoy Proxy metrics by HTTP agent from metrics endpoint.
https://www.envoyproxy.io/docs/envoy/v1.20.0/operations/stats_overview

Don't forget to change macros {$ENVOY.URL}, {$ENVOY.METRICS.PATH}.
Some metrics may not be collected depending on your Envoy Proxy instance version and configuration.

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Template tooling version used: 0.41