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https://istio.io/latest/docs/tasks/observability/metrics/tcp-metrics/
Understanding TCP telemetry collection In this task, you used Istio configuration to automatically generate and report metrics for all traffic to a TCP service within the mesh. TCP Metrics for all active connections are recorded every 15s by default and this timer is configurable via tcpReportingDuration. Metrics for a connection are also recorded at the end of the connection.
TCP attributes Several TCP-specific attributes enable TCP policy and control within Istio.