troubleshooting 
Linux Troubleshooting and Debugging Guide
A comprehensive Linux troubleshooting guide covering boot issues, CPU and memory problems, disk I/O, networking, services, permissions, and every essential debugging command with practical examples.
Kubernetes Troubleshooting Guide for Operators and Administrators
A comprehensive, production-focused Kubernetes troubleshooting guide covering pods, services, storage, nodes, networking, RBAC, and control plane issues with runbook-style diagnostic steps and resolution strategies.