[Alerting] Update docs to include new o11y features (#104884)

* Update docs to include new o11y features

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docs/user/production-considerations/task-manager-health-monitoring.asciidoc

@@ -57,8 +57,12 @@ xpack.task_manager.monitored_task_execution_thresholds:
 
 The health API is best consumed by via the `/api/task_manager/_health` endpoint.
 
-Additionally, the metrics are logged in the {kib} `DEBUG` logger at a regular cadence.
-To enable Task Manager DEBUG logging in your {kib} instance, add the following to your `kibana.yml`:
+Additionally, there are two ways to consume these metrics:
+
+*Debug logging*
+
+The metrics are logged in the {kib} `DEBUG` logger at a regular cadence.
+To enable Task Manager debug logging in your {kib} instance, add the following to your `kibana.yml`:
 
 [source,yml]
 ----
@@ -69,7 +73,22 @@ logging:
         level: debug
 ----
 
-These stats are logged based the number of milliseconds set in your <<task-manager-settings,`xpack.task_manager.poll_interval`>> setting, which means it could add substantial noise to your logs. Only enable this level of logging temporarily.
+These stats are logged based on the number of milliseconds set in your <<task-manager-settings,`xpack.task_manager.poll_interval`>> setting, which could add substantial noise to your logs. Only enable this level of logging temporarily.
+
+*Automatic logging*
+
+By default, the health API runs at a regular cadence, and each time it runs, it attempts to self evaluate its performance. If this self evaluation yields a potential problem,
+a message will log to the {kib} server log. In addition, the health API will look at how long tasks have waited to start (from when they were scheduled to start). If this number exceeds a configurable threshold (<<task-manager-settings,`xpack.task_manager.monitored_stats_health_verbose_log.warn_delayed_task_start_in_seconds`>>), the same message as above will log to the {kib} server log.
+
+This message looks like:
+
+[source,log]
+----
+Detected potential performance issue with Task Manager. Set 'xpack.task_manager.monitored_stats_health_verbose_log.enabled: true' in your Kibana.yml to enable debug logging`
+----
+
+
+If this message appears, set <<task-manager-settings,`xpack.task_manager.monitored_stats_health_verbose_log.enabled`>> to `true` in your `kibana.yml`. This will start logging the health metrics at either a `warn` or `error` log level, depending on the detected severity of the potential problem.
 
 [float]
 [[making-sense-of-task-manager-health-stats]]