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.
Debugging java.util.Optional NoSuchElementException: When get() Blows Up
A focused debugging guide for NoSuchElementException thrown by Optional.get() called on an empty Optional in Java. Covers root causes, diagnosis, fixes, and a real incident.
Debugging Java Virtual Threads: Pinning, Deadlock, and Carrier Thread Starvation
A hands-on guide to debugging common Java virtual thread failures: pinning, deadlock, and carrier thread starvation. Includes real diagnostics with jcmd, jfr, and thread dumps.
Java Kafka Consumer Not Receiving Messages
A step-by-step debugging guide for when your Java Kafka consumer stops receiving messages: root causes, diagnostic commands, and fix patterns.
Debugging Kubernetes Pod OOMKilled: Beyond the Memory Limit
A hands-on guide to diagnosing and fixing OOMKilled pods in Kubernetes, covering cgroup pressure, memory limits, and hidden memory consumers.
Kubernetes Pod Stuck in Pending: Debugging Resource and Scheduling Failures
A practical guide to diagnosing why a Kubernetes pod remains in Pending state, covering resource constraints, node affinity, taints, and PVC issues with real commands.
Kubernetes Service Not Reachable from Pod: Debugging Ingress, DNS & Network Policies
A practical guide to debugging why a Kubernetes Service is unreachable from within another Pod, covering DNS resolution, network policies, and endpoint health.
Long-form thinking on debugging habits, observability, and the systems around the bug.
How to Debug a Regression: A Practical Walkthrough
A practical, step-by-step guide to finding and fixing regression bugs, with real-world examples and concrete commands you can run today.
The Cost of Not Reproducing Bugs: Why Local Debugging Saves Hours
Skipping local reproduction leads to wasted hours, broken deploys, and frustrated teams. Here's why it's non-negotiable and how to do it right.
Debugging an Unfamiliar Codebase: A Systematic Approach
A repeatable process for debugging code you didn't write — with specific techniques, tooling choices, and a war story from a production outage at 2 AM.
5 Questions to Ask Yourself Before Filing a Bug Report
A senior engineer's pre-flight checklist for bug reports — forged in the fire of a production incident that turned a 5-minute fix into a 3-hour hunt.
Binary Search for Bugs: Cutting Down Bisection Time with git bisect run
Automating git bisect with a script turns days of manual hunting into minutes. Here's how to build a reliable bisection harness for your codebase.
Reading a Call Stack: What Each Frame Actually Tells You
A call stack shows you the path your code took to crash. But most developers only look at the top frame. Here’s how to read the whole thing — including async traces, native frames, and minified code.