interface  | 
Category | 
 Event annotation, to associate the event type with a category, in the format
 of a human-readable path. 
 | 
interface  | 
Enabled | 
 Event annotation, determines if an event should be enabled by default. 
 | 
interface  | 
Experimental | 
 Annotation that specifies that an element is experimental and may change
 without notice. 
 | 
interface  | 
Period | 
 Event annotation, specifies the default setting value for a periodic event. 
 | 
interface  | 
Registered | 
 Event annotation, for programmatic event registration. 
 | 
interface  | 
StackTrace | 
 Event annotation, determines whether an event by default has a stack trace
 or not. 
 | 
interface  | 
Threshold | 
 Event annotation, specifies the default duration below which an event is not
 recorded (for example, "20 ms"). 
 |