Your database says one thing. The external system says another. Reconciliation is how you find the drift before your users do.

100% availability is impossible and pursuing it wastes engineering time. SLOs turn reliability into a number you can reason about.

Grep through 50 log files to find one request. Or use structured logging with correlation IDs and find it in seconds.

Your average latency looks great. Your P99 is a disaster. Why tail latency matters more than averages, and what you can actually do about it.

When a request vanishes into a maze of 10 microservices. How Distributed Tracing and OpenTelemetry keep you from going insane during an outage.