Datadog APM Monitoring

Application Performance Monitoring (APM) via Datadog is the continuous tracking of how applications behave: which endpoints are slow, which are erroring, which are consuming CPU/memory. Engineers instrument code with Datadog agents, which send performance data to Datadog. Dashboards show real-time performance metrics and distributed traces (request flow across services). Example: User makes API request → Request traces through 5 microservices → Datadog shows waterfall (which service was slow?) and logs from each service.