Envoy Statistics
The Envoy proxy keeps detailed statistics about network traffic.
Envoy’s statistics only cover the traffic for a particular Envoy instance. See Observability for persistent per-service Istio telemetry. The statistics the Envoy proxies record can provide more information about specific pod instances.
To see the statistics for a pod:
$ kubectl exec $POD -c istio-proxy -- pilot-agent request GET stats
See the Envoy documentation for an explanation of the data recorded.
By default, Istio configures Envoy to record minimal statistics. The default collection keys are:
cluster_manager
listener_manager
server
cluster.xds-grpc
To see the Envoy settings for statistics data collection use
istioctl proxy-config bootstrap
and follow the
deep dive into Envoy configuration.
Envoy only collects statistical data on items matching the inclusion_list
within
the stats_matcher
JSON element.
To Configure Envoy to record statistics for inbound or outbound traffic, add the
sidecar.istio.io/statsInclusionPrefixes
annotation to the pod template in the Kubernetes Deployment
.
Add the cluster.outbound
prefix to gather data about outbound traffic activity and circuit breaking.
To gather data on inbound traffic, add the listener
prefix. The sample
fortio-deploy.yaml
shows use of sidecar.istio.io/statsInclusionPrefixes
with the cluster.outbound
prefix.
You can override the Envoy defaults to gather less data than usual. Use
sidecar.istio.io/statsInclusionPrefixes: cluster_manager,listener_manager
to collect the least statistics possible.