Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
Kubernetes ConfigMap Not Mounting as Volume – Debugging Guide
A practical guide to diagnose and fix ConfigMap volumes that fail to mount in Kubernetes pods, covering common misconfigurations and hidden gotchas.
Kubernetes PersistentVolumeClaim Stuck in Pending: Debugging Guide
A practical guide to debugging a PersistentVolumeClaim stuck in Pending state in Kubernetes, covering storage class misconfiguration, missing provisioner, and capacity issues.
Kubernetes RBAC 403 Forbidden: Debugging Authorization Denials
A practical guide to diagnosing and fixing Kubernetes RBAC 403 Forbidden errors, covering common causes, diagnosis steps, and fixes with real-world examples.
Kubernetes Ingress Not Routing Traffic: A Debugging Guide
A concrete debugging guide for when your Kubernetes Ingress controller stops routing traffic to services, covering diagnosis, common causes, and fixes.
Kubernetes HPA Not Scaling: Diagnosing and Fixing Stuck Autoscalers
A practical guide to debugging Horizontal Pod Autoscalers that refuse to scale, covering metrics pipeline issues, target utilization mismatch, and custom metrics pitfalls.
Kubernetes Node Not Ready: Beyond the Textbook
A practical guide to debugging Kubernetes nodes stuck in NotReady state, covering kubelet, CNI, disk pressure, and real-world edge cases.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Profiling SQL Queries: Finding and Fixing the Slow 5%
Profiling SQL queries is more than running EXPLAIN. This guide covers practical techniques to find the slowest queries, interpret execution plans, and fix them — with real examples from PostgreSQL and MySQL.
Debugging Character Encoding Problems: From Gibberish to Unicode
A practical guide to identifying and fixing character encoding problems, from broken UTF-8 to hidden BOM bytes, with real debugging examples.
Debugging Timezone Date Bugs: A Case Study in UTC vs. Local Time
A practical walkthrough of a timestamp bug that broke a billing system, with reproducible code and debugging tactics.
Floating Point Arithmetic Errors: A Debugging Postmortem
How a $0.0000000000000004 error silently corrupted a financial system, and the debugging techniques that caught it.
Why JSON.parse() Throws and How to Catch It: A Field Guide to Parsing Failures
JSON.parse() seems simple until it throws. Here's a practical guide to the most common — and most maddening — parsing failures I've encountered, with exact error messages and fixes.
Debugging Third-Party API Issues: A Systematic Approach
A practical guide to diagnosing and fixing third-party API integration problems, with real-world examples and a step-by-step debugging framework.