Term Kind Topic What it is
APM Transaction Tracing tool Application Performance Monitoring Instrumentation that attributes application latency and errors to specific code paths, database queries and external calls, usually with automatic tracing.
Application Performance Monitoring APM tool Application Performance Monitoring Instrumentation that attributes latency and errors to code paths and dependencies inside a service — the layer between metrics and a profiler.
Outlier Alerting Per-Tenant Alerting, Worst-Case Alerting practice Application Performance Monitoring Alerting on the worst-affected segment rather than on an aggregate, because in skewed populations the aggregate is dominated by the segment that is fine.