Metrics

Use Istio metrics that the ingress gateway emits to monitor and troubleshoot the requests that pass through your ingress gateway.

1. Open the Prometheus UI.

2. Send multiple requests to the reviews page.
   

   • HTTP
   • HTTPS

   for ((i=1;i<=10;i++)); do curl -vik --resolve www.example.com:80:${INGRESS_GW_IP} http://www.example.com:80/reviews/1 ; done
   

   for ((i=1;i<=10;i++)); do curl -vik --resolve www.example.com:443:${INGRESS_GW_IP} https://www.example.com:443/reviews/1 ; done
   

3. From the Prometheus expression browser, enter the following PromQL query to see the requests that were sent to the ingress gateway.

   istio_requests_total
   

4. Explore other queries that you run in the Prometheus expression browser to gain insight into your API Gateway.