Metrics

Use Istio metrics that the workload's sidecar proxies emit to monitor and troubleshoot traffic in your service mesh.

1. Open the Prometheus UI.

2. Set up port forwarding for the product page of the Istio Bookinfo app.

   kubectl -n bookinfo port-forward deploy/productpage-v1 9080 --context $REMOTE_CONTEXT1
   

3. Send multiple requests to the product page. Each request to the product page requires the product page to collect data from other Bookinfo microservices. For each request, metrics are automatically sent to the Prometheus server.

   for ((i=1;i<=10;i++)); do curl -I -k "http://localhost:9080/productpage"; done
   

4. From the Prometheus UI, enter the following PromQL query to see how many requests the product page's Envoy proxy in cluster1 sent to other Bookinfo microservices.

   sum(istio_requests_total{source_workload="productpage-v1"}) by (workload_id,destination_workload_id, response_code)
   

5. Explore other queries that you run in the Prometheus UI to gain insight into your service mesh.