OpenAPI docs for APM UI APIs - manual backport to 8.x#198550

miloszmarcinkowski merged 1 commit intoelastic:8.xelastic/kibana:8.xfrom

miloszmarcinkowski:backport/197582-apmdocs-add-openapi-spec-for-undocumented-public-apismiloszmarcinkowski/kibana:backport/197582-apmdocs-add-openapi-spec-for-undocumented-public-apisCopy head branch name to clipboard