If you do not see any data in the Gloo UI graph, review the following steps to debug the metrics pipeline and the Gloo UI deployment.

  1. Enable port-forwarding of the Prometheus server deployment.

      kubectl --context $MGMT_CONTEXT port-forward -n gloo-mesh deploy/prometheus-server 9090
  2. Open the scraping endpoints that are configured for the Prometheus server.

      open http://localhost:9090/targets
  3. Check for a green UP state, such as in the following figure.

    Figure: Example of green **UP** state.
  4. Check the following query: http://localhost:9090/graph?g0.expr=istio_requests_total&g0.tab=1&g0.stacked=0&g0.range_input=1h.

  5. If you get an Empty query result from the previous step, follow the steps in Monitor the health of receivers, exporters, and processors to verify that metrics are being scraped by the Gloo collector agents and sent to the telemetry gateway.