# Event object
The following objects are directly related to the `event` API.
### Event
::: noteclassic
Events are created by the Zabbix server and cannot be
modified via the API.
:::
The event object has the following properties.
|Property|[Type](/manual/api/reference_commentary#data_types)|Description|
|--------|---------------------------------------------------|-----------|
|eventid|string|ID of the event.|
|acknowledged|integer|Whether the event has been acknowledged.|
|clock|timestamp|Time when the event was created.|
|ns|integer|Nanoseconds when the event was created.|
|object|integer|Type of object that is related to the event.
Possible values for trigger events:
0 - trigger.
Possible values for discovery events:
1 - discovered host;
2 - discovered service.
Possible values for auto-registration events:
3 - auto-registered host.
Possible values for internal events:
0 - trigger;
4 - item;
5 - LLD rule.|
|objectid|string|ID of the related object.|
|source|integer|Type of the event.
Possible values:
0 - event created by a trigger;
1 - event created by a discovery rule;
2 - event created by active agent auto-registration;
3 - internal event.|
|value|integer|State of the related object.
Possible values for trigger events:
0 - OK;
1 - problem.
Possible values for discovery events:
0 - host or service up;
1 - host or service down;
2 - host or service discovered;
3 - host or service lost.
Possible values for internal events:
0 - "normal" state;
1 - "unknown" or "not supported" state.
This parameter is not used for active agent auto-registration events.|