Announcement
kube-state-metrics - Kubernetes Cluster State Metrics Exporter
An add-on agent that listens to the Kubernetes API server and generates metrics about the state of the objects, such as deployments, nodes, and pods. It's primarily used with Prometheus for monitoring and alerting.
Project Introduction
Summary
Kube-state-metrics is a simple service that listens to the Kubernetes API server and generates metrics about the state of the objects. It generates metrics based on the API objects without any modifications to the objects themselves.
Problem Solved
Kubernetes control plane components (like the API server, controller manager) don't expose detailed, Prometheus-format metrics about the *state* of all Kubernetes objects (e.g., number of ready replicas in a deployment, pending pods). Kube-state-metrics fills this gap.
Core Features
Comprehensive Metrics
Exposes a large number of detailed metrics about Kubernetes objects (pods, deployments, nodes, services, etc.).
Prometheus Native
Designed to integrate seamlessly with Prometheus, providing metrics in a format Prometheus can scrape.
Non-Intrusive
Acts as a read-only service, only querying the API server and not interacting with control plane components.
Tech Stack
使用场景
Kube-state-metrics is crucial for various Kubernetes monitoring and management scenarios:
Scenario 1: Application Health Monitoring
Details
Monitor the number of ready, pending, or failed pods for specific deployments, statefulsets, or jobs.
User Value
Provides insights into application stability and enables rapid detection of issues like insufficient replicas or stuck pods.
Scenario 2: Resource Usage & Capacity Planning
Details
Track the resource requests and limits defined for pods and containers across the cluster.
User Value
Helps understand cluster resource allocation, identify potential bottlenecks, and inform capacity planning decisions.
Scenario 3: Proactive Alerting
Details
Set up alerts based on the state of Kubernetes objects, like receiving an alert when a PersistentVolumeClaim enters a pending state or a node is NotReady.
User Value
Enables automation of operational responses by triggering alerts on critical cluster or application state changes.
Recommended Projects
You might be interested in these projects
open-telemetryopentelemetry-go-contrib
This project provides a collection of valuable extensions, instrumentations, and exporters for OpenTelemetry-Go, enabling broader compatibility and enhanced observability features for Go applications.
sunfacerust-by-practice
Learning Rust By Practice, narrowing the gap between beginner and skilled-dev through challenging examples, exercises and projects.
sveltejssvelte
Svelte is a radical new approach to building user interfaces. Whereas traditional frameworks like React and Vue do the bulk of their work in the browser, Svelte shifts that work into a compile step that happens when you build your app.