• Querying Metrics from Prometheus
    • Before you begin
    • Querying Istio metrics
      • About the Prometheus add-on
    • Cleanup
    • See also

    Querying Metrics from Prometheus

    This task shows you how to query for Istio Metrics using Prometheus. As part ofthis task, you will use the web-based interface for querying metric values.

    The Bookinfo sample application is used asthe example application throughout this task.

    Before you begin

    Install Istio in your cluster and deploy anapplication.

    Querying Istio metrics

    • Verify that the prometheus service is running in your cluster.

    In Kubernetes environments, execute the following command:

    1. $ kubectl -n istio-system get svc prometheus
    2. NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
    3. prometheus 10.59.241.54 <none> 9090/TCP 2m
    • Send traffic to the mesh.

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

    1. $ curl http://$GATEWAY_URL/productpage

    $GATEWAY_URL is the value set in the Bookinfo example.

    • Open the Prometheus UI.

    In Kubernetes environments, execute the following command:

    1. $ istioctl dashboard prometheus

    Click Graph in Prometheus.

    • Execute a Prometheus query.

    In the “Expression” input box at the top of the web page, enter the text:istio_requests_total. Then, click the Execute button.

    The results will be similar to:

    Prometheus Query Result

    Prometheus Query Result

    Other queries to try:

    • Total count of all requests to the productpage service:
    1. istio_requests_total{destination_service="productpage.default.svc.cluster.local"}
    • Total count of all requests to v3 of the reviews service:
    1. istio_requests_total{destination_service="reviews.default.svc.cluster.local", destination_version="v3"}

    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:
    1. rate(istio_requests_total{destination_service=~"productpage.*", response_code="200"}[5m])

    About the Prometheus add-on

    Mixer comes with a built-in Prometheus adapter thatexposes an endpoint serving generated metric values. The Prometheus add-on is aPrometheus server that comes preconfigured to scrape Mixer endpoints to collectthe exposed metrics. It provides a mechanism for persistent storage and queryingof Istio metrics.

    The configured Prometheus add-on scrapes the following endpoints:

    • istio-telemetry.istio-system:42422: The istio-mesh job returns all Mixer-generated metrics.
    • istio-telemetry.istio-system:15014: The istio-telemetry job returns all Mixer-specific metrics. Use this endpoint to monitor Mixer itself.
    • istio-proxy:15090: The envoy-stats job returns raw stats generated by Envoy. Prometheus is configured to look for pods with the envoy-prom endpoint exposed. The add-on configuration filters out a large number of envoy metrics during collection in an attempt to limit the scale of data by the add-on processes.
    • istio-pilot.istio-system:15014: The pilot job returns the Pilot-generated metrics.
    • istio-galley.istio-system:15014: The galley job returns the Galley-generated metrics.
    • istio-policy.istio-system:15014: The istio-policy job returns all policy-related metrics.
    • istio-citadel.istio-system:15014: The istio-citadel job returns all Citadel-generated metrics.For more on querying Prometheus, please read their queryingdocs.

    Cleanup

    • Remove any istioctl processes that may still be running using control-C or:
    1. $ killall istioctl
    • If you are not planning to explore any follow-on tasks, refer to theBookinfo cleanup instructionsto shutdown the application.

    See also

    Collecting Metrics

    This task shows you how to configure Istio to collect and customize metrics.

    Collecting Metrics for TCP services

    This task shows you how to configure Istio to collect metrics for TCP services.

    Mixer and the SPOF Myth

    Improving availability and reducing latency.

    Mixer Adapter Model

    Provides an overview of Mixer's plug-in architecture.

    Collecting Logs

    This task shows you how to configure Istio to collect and customize logs.

    Getting Envoy's Access Logs

    This task shows you how to configure Envoy proxies to print access log to their standard output.