Customizing Istio metrics
Istio provides flexibility to observe metrics other than what comes out of the box. This provides flexibility to observe application-specific metrics. With that in mind, let’s begin by looking at the /stats/prometheus endpoint exposed by the sidecar:
% kubectl exec front-end-6c768c478-82sqw -n sock-shop -c istio-proxy -- curl -sS 'localhost:15000/stats/prometheus' | grep istio_requests_total
The following screenshot shows sample data returned by this endpoint, which is also scraped by Prometheus and is the same data you saw using the dashboard in the previous section:
Figure 7.8 – Istio metric, dimensions, and value
The metric is organized in the following structure:
- Metric name: This is the name of the metric exported by Istio. Out-of-the-box Istio generates many metric details, which can be found at https://istio.io/latest/docs/reference/config/metrics/#metrics.
- Metric dimensions: These...
