Message event symptoms are based on events received as messages from a component of vRealize Operations Manager or from an external monitored system through the system's REST API. You define symptoms based on message events to include in alert definitions that use these symptoms. When the configured symptom condition is true, the symptom is triggered.

The adapters for the external monitored systems and the REST API are inbound channels for collecting events from external sources. Adapters and the REST server both run in the vRealize Operations Manager system. The external system sends the messages, and vRealize Operations Manager collects them.

You can create message event symptoms for the supported event types. The following list is of supported event types with example events.

System Performance Degradation. This message event type corresponds to the EVENT_CLASS_SYSTEM and EVENT_SUBCLASS_PERFORM_DEGRADATION type and subtype in the vRealize Operations Manager API SDK.

Change. The VMware adapter sends a change event when the CPU limit for a virtual machine is changed from unlimited to 2 GHz. You can create a symptom to detect CPU contention issues as a result of this configuration change. This message event type corresponds to the EVENT_CLASS_CHANGE and EVENT_SUBCLASS_CHANGE type and subtype in the vRealize Operations Manager API SDK.

Environment Down. The vRealize Operations Manager adapter sends an environment down event when the collector component is not communicating with the other components. You can create a symptom that is used for internal health monitoring. This message event type corresponds to the EVENT_CLASS_ENVIRONMENT and EVENT_SUBCLASS_DOWN type and subtype in the vRealize Operations Manager API SDK.

Notification. This message event type corresponds to the EVENT_CLASS_NOTIFICATION and EVENT_SUBCLASS_EXTEVENT type and subtype in the vRealize Operations Manager API SDK.