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 · 96 articles · 13 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.
Prisma Connection Pool Timeout: Diagnosis and Fixes
A practical guide to diagnosing and fixing Prisma connection pool timeouts in production Node.js apps. Covers under-documented causes like micro-bursts, PgBouncer misconfiguration, and stalled transactions.
Drizzle ORM Migration Not Detecting Schema Changes
A comprehensive guide to debugging Drizzle ORM migrations that fail to detect schema changes, including snapshot mismatches, introspect issues, and push conflicts.
PostgreSQL JSONB Column Query Slow: Diagnosis and Fix
A practical guide to diagnosing and fixing slow queries on JSONB columns in PostgreSQL, covering indexing, query patterns, and common pitfalls.
Postgres Partition Pruning Not Working: A Diagnostic Guide
Diagnose and fix Postgres partition pruning failures. Covers planner limitations, parameterized queries, and partition key type mismatches.
Django Migration Conflict Error: How to Diagnose and Resolve
A practical debugging guide for Django migration conflicts caused by parallel branches, merge order, or circular dependencies.
Debugging Lost Error Context in Go: When %w and errors.Is/As Fail
A guide to debugging Go error wrapping with fmt.Errorf %w when errors.Is/As return false unexpectedly, covering sentinel values, wrapping multiple errors, and nil checks.
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.