Application Performance Monitoring - tools that track how well your application performs and where bottlenecks occur. Like having a fitness tracker for your software that shows which parts are working hard and which are slowing down.
APM tools like New Relic show you that your checkout page takes 3 seconds to load because of a slow database query, not because of network issues.
All provide APM capabilities such as distributed tracing, latency/error analysis, and service dependency insights. Azure Application Insights is a full APM experience within Azure Monitor. AWS CloudWatch Application Signals builds on CloudWatch and OpenTelemetry to provide service-level health and performance. GCP’s APM experience is typically composed of Cloud Trace (tracing), Cloud Monitoring (metrics), and Cloud Logging (logs). OCI APM is a dedicated APM service for tracing and performance analytics.