Prometheus Troubleshooting Guides

Prometheus errors can surface at the worst possible moments — during deployments, under peak traffic, or in the middle of critical operations. This collection of 4 troubleshooting guides covers the most common Prometheus issues encountered in DevOps tooling, CI/CD pipelines, and infrastructure as code. Each article walks through specific error messages with step-by-step diagnosis, root cause analysis, and verified solutions. Whether you're dealing with configuration problems, authentication failures, timeout errors, or unexpected behavior, these guides are designed to get you from error message to resolution as quickly as possible. Solutions are backed by official documentation and real-world production experience.

Error Quick Reference

Article	Description
Fixing 'Prometheus Connection Refused' and CrashLoopBackOff Errors	Diagnose and resolve Prometheus connection refused, CrashLoopBackOff, and OOMKilled errors. Learn how to fix permission denied and timeout issues in Kubernetes.
Fixing 'Prometheus Not Sending Alerts to Alertmanager' and Slack Notification Routing Failures	Resolve missing Prometheus alerts, troubleshoot Alertmanager configuration, and fix kube-prometheus-stack routing issues for Slack and OpsGenie notifications.
How to Fix Prometheus Connection Refused, CrashLoopBackOff, and OOMKilled Errors	Fix Prometheus connection refused, CrashLoopBackOff, and OOM errors. SRE guide to diagnosing memory limits, TSDB corruption, permissions, and network timeouts.
Prometheus Connection Refused: Complete Troubleshooting Guide (CrashLoopBackOff, OOM, Permission Denied)	Fix Prometheus 'connection refused', CrashLoopBackOff, OOM kills, and permission denied errors with step-by-step commands and config examples.