@gitgoodordietrying

dns-networking covers dns query patterns, port connectivity testing, firewall rule inspection, curl diagnostics with timing breakdown, /etc/hosts configuration, and certificate validation. includes practical scripts and multi-platform command variants.

cron-scheduling covers cron syntax, crontab management, systemd timers, one-off scheduling with at and sleep, timezone handling including DST pitfalls, and debugging patterns with concrete examples for monitoring and preventing job overlap.

test-patterns covers unit, integration, and e2e testing across node.js, python, go, rust, and bash. includes mocking, coverage measurement, fixture setup, and tdd workflow guidance with concrete examples.

Profile and optimize application performance. Use when diagnosing slow code, measuring CPU/memory usage, generating flame graphs, benchmarking functions, load testing APIs, finding memory leaks, or optimizing database queries.