DevOps
8 min read

Kubernetes HPA with Custom Metrics: Scaling Guide

Master horizontal pod autoscaling with Prometheus metrics. Learn how custom metrics flow through the HPA controller to trigger intelligent scaling decisions in production environments.

HPA Scaling Flow Architecture

Production Best Practices

Configuration Tips

  • Set appropriate min/max replica bounds to prevent resource exhaustion
  • Configure stabilization windows to prevent scaling flapping
  • Use multiple metrics with proper weights for robust scaling

Common Pitfalls

  • Avoid high-cardinality metrics that impact adapter performance
  • Don't ignore pod readiness delays in scaling calculations
  • Never skip RBAC permissions for metrics API access