Mixer is the component that manages telemetry in Istio's architecture. It takes the statistics from the side proxy, deployed along with the application container, and interacts with other backend components through its adapters. For instance, our monitoring backend is Prometheus, so we can utilize the Prometheus adapter of mixer to transform the metrics we get from envoy proxies into a Prometheus metrics path.

The way in which access logs go through the pipeline to our Fluentd/Fluent Bit logging backend is the same as in the one we built previously, the one that ships logs into Elasticsearch. The interactions between Istio components and the monitoring backends are illustrated in the following diagram: