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.
GitHub Actions Secret Not Available in Fork: The Inherent Trust Boundary
When a forked PR fails because secrets are missing, it's not a bug—it's an intentional security boundary. This guide shows how to detect, work around, and verify the issue.
Debugging GitHub Actions Cache Restore Miss: Why Your Actions Aren't Finding Cache
A practical guide to diagnosing and fixing cache restore misses in GitHub Actions workflows, covering key collisions, exact key matching, and non-obvious causes like branch scoping.
GitLab CI Pipeline Stuck in Pending: Debugging Runner Availability and Tag Mismatches
Diagnose why your GitLab CI pipeline stays pending. Covers runner registration, tag mismatches, concurrency limits, and queue backlogs.
Debugging Jenkins Pipeline Build Failures That Don't Show in Console Output
A practical guide to debugging Jenkins pipeline build failures that fail silently, with no obvious errors in the console log.
Pre-Commit Hook Failing: Debugging and Fixing Hook Execution Errors
A practical guide to diagnosing and resolving pre-commit hook failures in Git repositories, covering configuration, environment, and script issues.
Turborepo Cache Not Hitting – Debugging Remote and Local Cache Misses
A practical guide to diagnosing why Turborepo's cache is not hitting, covering both local and remote cache misses with concrete commands and root causes.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Logs, Traces, and the Lies They Tell: Debugging a Stuck Queue in Production
A single stuck queue brought down an entire checkout flow. Here's how we traced the failure across services, what the logs didn't say, and the tools that finally showed the truth.
Pair Debugging: How to Debug Together Without Killing Each Other
Pair debugging sounds great on paper. In practice, it's easy to step on each other's toes, go silent, or fight over the keyboard. Here's how to make it work.
Debugging with AI Tools: What Worked and What Didn't in Production
After a year of using GPT-4, Copilot, and Claude to hunt production bugs, here's what actually helped — and what sent me down dead ends.
How to Debug Legacy Code Without Losing Your Mind
A pragmatic approach to debugging code you didn't write, with techniques for tracing execution, isolating side effects, and making safe edits.
Debugging Feature Flag Rollouts: Tracing the Live-at-5 Incident
A misconfigured feature flag triggered a cascading failure in production. Here's how we traced the root cause and built a better debugging toolkit.
How to Ask for Debugging Help Without Wasting Everyone's Time
Asking for debugging help is a skill. Here's how to provide enough context, show your work, and frame the problem so others can actually help you.