Starting with version 8.12, the content from the APM guide has been moved to the Observability guide.

Previous versions:

APM Guide: 8.11
APM Guide: 8.10
APM Guide: 8.9
APM Guide: 8.8
APM Guide: 8.7
APM Guide: 8.6
APM Guide: 8.5
APM Guide: 8.4
APM Guide: 8.3
APM Guide: 8.2
APM Guide: 8.1
APM Guide: 8.0
APM Guide: 7.17
APM Guide: 7.16