Ember instrumentation's instrument event listening time

I am using Ember

Ember.Instrumentation.instrument("message.from.jsp",data,function(){}), inside a function which is called on clicking a link .

It is in a landing jsp page in my website and subscribed it in application route using Ember.Instrumentation.subscribe("message.from.jsp",{ before: function(){} after: function(){} }).

I have not unsubscribed it in the application route. After sometime subscriber's before and after hooks is not called.

Is there any maximum listenting time for ember.instrument by default or any other reason before and after hooks in subscriber are not called ?