intervalEnd 
  End a previously started interval.
Cancels any timeout set by the corresponding intervalStart.
Return
Duration of the interval.
Parameters
wideEventId  
ID of the wide event.
key
Interval key passed to intervalStart.
End a previously started interval.
Cancels any timeout set by the corresponding intervalStart.
Duration of the interval.
ID of the wide event.
Interval key passed to intervalStart.