Debug the Gloo UI graph
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.
Enable port-forwarding of the Prometheus server deployment.
kubectl port-forward -n gloo-mesh deploy/prometheus-server 9090
Open the scraping endpoints that are configured for the Prometheus server.
Check for a green UP state, such as in the following figure.
Check the following query: http://localhost:9090/graph?g0.expr=istio_requests_total&g0.tab=1&g0.stacked=0&g0.range_input=1h.
If you get an
Empty query resultfrom 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.