Metrics in Kubernetes

Internal

• Kubernetes Resource Management Concepts
• Kubernetes Concepts

Metric

Resource Metric

A resource metric is a numeric quantity that tracks the value of a resource specified by a Kubernetes API resource - for example, the CPU utilization of a container.

Kubernetes Metrics Server

Kubernetes Metrics Server

Resource Metrics API

metrics.k8s.io

TODO:

• https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/resource-metrics-api.md
• https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/custom-metrics-api.md

Notes

• More details about resource metrics API.
• Metrics: raw values, utilization values.
• Metric server: https://kubernetes.io/docs/tasks/debug-application-cluster/resource-metrics-pipeline/, https://github.com/kubernetes-sigs/metrics-server
• Custom metrics API: https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/custom-metrics-api.md
• External metrics API: https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/external-metrics-api.md