➜  istio-1.16.5 kubectl -n istio-system get pod
NAME                                     READY   STATUS    RESTARTS   AGE
istio-eastwestgateway-64fd87c956-8nlpg   1/1     Running   0          29h
istiod-66c5ff9789-bsc75                  1/1     Running   0          29h

kubectl -n istio-system port-forward --address 0.0.0.0 pod/prometheus-85674d4cb8-f7q2l 9090:9090
http://localhost:9090/graph

kubectl -n istio-system port-forward --address 0.0.0.0 pod/grafana-8cb9f8f79-5b42p   3000:3000

http://localhost:3000

➜  istio-1.16.5 kubectl -n istio-system get pod
NAME                                     READY   STATUS    RESTARTS   AGE
grafana-8cb9f8f79-5b42p                  1/1     Running   0          2d2h
istio-eastwestgateway-64fd87c956-8nlpg   1/1     Running   0          3d4h
istiod-66c5ff9789-bsc75                  1/1     Running   0          3d4h
prometheus-85674d4cb8-f7q2l              2/2     Running   0          3d3h

cat <<EOF > ./custom_metrics.yaml
apiVersion: telemetry.istio.io/v1alpha1
kind: Telemetry
metadata:
  name: namespace-metrics
spec:
  metrics:
  - providers:
    - name: prometheus
    overrides:
    - match:
        metric: REQUEST_COUNT
      tagOverrides:
        destination_port:
          value: "string(destination.port)"
        request_host:
          value: "request.host"
EOF
kubectl apply -f custom_metrics.yaml

{
	"protocol": "HTTP/1.1"，
	"upstream_host": "172.16.0.20:9080"，
	"upstream_service_time": "1"，
	"upstream_cluster": "inbound|9080||"，
	"downstream_remote_address": "172.16.0.44:47564"，
	"requested_server_name": null，
	"bytes_sent": 0，
	"response_code_details": "via_upstream"，
	"method": "HEAD"，
	"x_forwarded_for": null，
	"route_name": "default"，
	"duration": 2，
	"response_flags": "-"，
	"user_agent": "curl/7.81.0"，
	"upstream_local_address": "127.0.0.6:38005"，
	"bytes_received": 0，
	"start_time": "2023-12-15T11:53:34.218Z"，
	"upstream_transport_failure_reason": null，
	"request_id": "af309304-4b56-43e1-9b33-02a5faa9bdd3"，
	"path": "/"，
	"downstream_local_address": "172.16.0.20:9080"，
	"connection_termination_details": null，
	"response_code": 200，
	"authority": "productpage:9080"
}

istio_requests_total{app="productpage"， connection_security_policy="none"， destination_app="productpage"， destination_canonical_revision="v1"， destination_canonical_service="productpage"， destination_cluster="gz-cce-hh4z2ea2"， destination_port="9080"， destination_principal="unknown"， destination_service="productpage.default.svc.cluster.local"， destination_service_name="productpage"， destination_service_namespace="default"， destination_version="v1"， destination_workload="productpage-v1"， destination_workload_namespace="default"， instance="172.16.0.20:15020"， job="kubernetes-pods"， namespace="default"， pod="productpage-v1-66756cddfd-hl9df"， pod_template_hash="66756cddfd"， reporter="destination"， request_host="productpage:9080"， request_protocol="http"， response_code="200"， response_flags="-"， security_istio_io_tlsMode="istio"， service_istio_io_canonical_name="productpage"， service_istio_io_canonical_revision="v1"， source_app="unknown"， source_canonical_revision="latest"， source_canonical_service="unknown"， source_cluster="unknown"， source_principal="unknown"， source_version="unknown"， source_workload="unknown"， source_workload_namespace="unknown"， topology_istio_io_network="gz"， version="v1"}