led overview of <a href="https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/observability/statistics.html?highlight=statistics">Envoy statistics collection</a>.
The operations guide on <a href=/v1.12/docs/ops/diagnostic-tools/proxy-cmd/>Envoy Statistics</a> provides more information on controlling the generation of proxy-level metrics.</p><p>Example proxy-level Metrics:</p><pre><code class=language-json data-expandlinks=true data-repo=istio>envoy_cluster_internal_upstream_rq{response_code_class