Remove APM annotation API page

Author: lcawl

solutions/observability/apps/annotation-api.md

@@ -11,7 +11,7 @@ applies_to:
 Some Applications UI features are provided via a REST API:
 
 * Agent Configuration API ([{{stack}}](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-agent-configuration) or [{{serverless-short}}](https://www.elastic.co/docs/api/doc/serverless/group/endpoint-apm-agent-configuration))
-* [Annotation API](annotation-api.md)
+* Annotation API ([{{stack}}](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-annotations) or [{{serverless-short}}](https://www.elastic.co/docs/api/doc/serverless/group/endpoint-apm-annotations))
 * [RUM source map API](rum-source-map-api.md)
 * [APM agent Key API](apm-agent-key-api.md)
 

solutions/observability/apps/apm-ui-api.md

@@ -26,7 +26,7 @@ By default, automatic deployment annotations are enabled. This means APM will cr
 
 Alternatively, you can explicitly create deployment annotations with our annotation API. The API can integrate into your CI/CD pipeline, so that each time you deploy, a POST request is sent to the annotation API endpoint.
 
-Refer to the [annotation API](../../../solutions/observability/apps/annotation-api.md) reference for more information.
+Refer to the [annotation API reference](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-annotations) for more information.
 
 ::::{note}
 If custom annotations have been created for the selected time period, any derived annotations, i.e., those created automatically when `service.version` changes, will not be shown.

solutions/observability/apps/track-deployments-with-annotations.md

@@ -165,7 +165,6 @@ toc:
                 children:
                   - file: observability/apps/apm-ui-api.md
                     children:
-                      - file: observability/apps/annotation-api.md
                       - file: observability/apps/rum-source-map-api.md
                       - file: observability/apps/apm-agent-key-api.md
                       - file: observability/apps/managed-intake-service-event-api.md