Monitoring
Uptime monitoring tells you your server is responding. It doesn't tell you your application is working. A web app can be "up" — server responding, HTTP 200 — while the login flow is broken, the checkout form is throwing JavaScript errors, or a critical API endpoint is returning
QA Strategy
"Testing in production" used to be an insult — shorthand for teams that didn't test at all and used their users as beta testers. Today it's a deliberate strategy used by some of the most reliable engineering organizations in the world. The distinction is important:
Testing
Test results that live only in CI logs are easy to miss. Routing pass/fail summaries to Slack means the right people see failures the moment they happen — not hours later when someone thinks to check the pipeline. Here's how to set it up with webhooks. Creating a
Observability
Datadog is not just a dashboard—it's a test surface. This guide covers asserting APM trace structure in tests, using Datadog Synthetics as CI quality gates, enforcing p99 latency thresholds before deployment, and mocking the Datadog agent so unit tests stay fast and isolated. Key Takeaways APM traces
SRE
Synthetic monitoring runs scripted tests against your application continuously — from multiple geographic locations, using real browsers or API clients — to detect issues before users report them. Combined with canary deployments, it becomes your automated deployment safety net. Synthetic Monitoring Fundamentals Synthetic monitors are different from real user monitoring (RUM): Synthetic