Querying Metrics from Prometheus

The sample application is used as the example application throughout this task.

• Install Istio in your cluster.
• Install the .

1. Verify that the service is running in your cluster.

   In Kubernetes environments, execute the following command:

2. Send traffic to the mesh.

   For the Bookinfo sample, visit http://$GATEWAY_URL/productpage in your web browser or issue the following command:

   $ curl "http://$GATEWAY_URL/productpage"

   $GATEWAY_URL is the value set in the Bookinfo example.

3. Open the Prometheus UI.

   In Kubernetes environments, execute the following command:

4. Execute a Prometheus query.

   In the “Expression” input box at the top of the web page, enter the text:

   Then, click the Execute button.

The results will be similar to:

Prometheus Query Result

You can also see the query results graphically by selecting the Graph tab underneath the Execute button.

Other queries to try:

• Total count of all requests to v3 of the reviews service:

  This query returns the current total count of all requests to the v3 of the reviews service.

• Rate of requests over the past 5 minutes to all instances of the productpage service:

The Prometheus addon is a Prometheus server that comes preconfigured to scrape Istio endpoints to collect metrics. It provides a mechanism for persistent storage and querying of Istio metrics.

For more on querying Prometheus, please read their .

• Remove any istioctl processes that may still be running using control-C or: