🚀 Building a Simple Kubernetes API Monitor in Go

Kubernetes moves fast, and deprecated APIs can break your workloads without warning. What if you had a lightweight tool that keeps track of these changes?

In this post, I’ll walk you through building a Kubernetes API monitoring tool using Go, exposing metrics via Prometheus, and packaging it with a Helm chart.

🛠️ What This Tool Does
• Scans for deprecated/removed Kubernetes APIs in a cluster
• Exposes findings via a Prometheus metrics endpoint
• Ships with a Helm chart for easy deployment
• Includes Prometheus alert rules to notify you of risky APIs

🔥 Why Build This?

While tools like kubectl deprecations exist, they often require manual execution. A Kubernetes-native monitoring solution ensures continuous tracking and alerting, integrating directly with Prometheus.

📜 Getting Started
1. Write a Go script using client-go to list API versions.
2. Compare them with Kubernetes’ deprecation policy.
3. Serve findings as Prometheus metrics (/metrics endpoint).
4. Package the tool with a Helm chart (Deployment + ServiceMonitor).

💡 Next Steps
• Add a Grafana dashboard for visual insights
• Extend functionality to check for feature gates
• Implement a webhook notifier for Slack & Teams

This is just a sneak peek—I’ll be sharing the full codebase and Helm chart in a follow-up post. Stay tuned!

🚀 What’s your favorite way to track Kubernetes API changes? Drop your thoughts below!

Would you like me to tweak the tone or add anything before you publish? 🚀