Since monitoring is an important part of operating a service, the existing monitoring system in our infrastructure might already provide solutions for collecting metrics from common sources like well-known open source software and the operating system. As for applications run on Kubernetes, let's have a look at what Kubernetes and its ecosystem offer.
To collect metrics of containers managed by Kubernetes, we don't have to install any special controller on the Kubernetes master node, nor any metrics collector inside our containers. This is basically done by kubelet, which gathers various telemetries from a node, and exposes them in the following API endpoints (as of Kubernetes 1.13):
- /metrics/cadvisor ...
