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.
The Debugging Mindset: A Systematic Method for Finding Root Causes
A repeatable, hypothesis-driven approach to debugging that works for intermittent failures, performance regressions, and production incidents.
Analyzing a Core Dump: What to Do When Your Process Goes Silent
A core dump is your process's last scream. Here's how to make it talk.
Timeouts Every Engineer Gets Wrong (and How to Fix Them)
Most timeout bugs aren't logic errors — they're configuration failures. Here's how to stop treating timeouts as magic numbers and start engineering them deliberately.
Backpressure in Streaming Systems: When Your Pipeline Fights Back
Backpressure is the system's way of saying 'slow down.' Ignore it and you get OOM crashes, silent data loss, or cascading failures. Here's how to design for it.
Finding Memory Leaks Step by Step: A Systematic Approach
Memory leaks are the silent killers of long-running services. Here's a repeatable process to hunt them down, from heap dumps to production monitoring.