NodeJS - Add monitoring for EventEmitter & EventListener

I have an EventEmitter EE which emits event E. There are multiple event listeners L1, L2 & L3 for the same event E.

Now, I want to periodically check if both event emitter & listeners are functioning properly i.e

1. Is EventEmitter EE still emitting event E?
2. Are EventListeners L1, L2 & L3 still listening to event E?
3. Has the EvenEmitter EE been killed due to some reason or stopped functioning?
4. Have the listeners L1, L2 & L3 been killed due to some reason or stopped functioning?

Idea is to have an auto-heal mechanism where system learns that the event emitter & corresponding listeners both have stopped functioning or either of them has stopped functioning & re-registers itself to work without breaking the flow.

How do I go about?

Below is the sample implementation.

var events = require('events');
var eventEmitter = new events.EventEmitter();

//Create an event handler:
var myEventHandler1 = function () {
  console.log('I hear a scream 1!');
}

//Create an event handler:
var myEventHandler2 = function () {
  console.log('I hear a scream 2!');
}

//Assign the event handler to an event:
eventEmitter.on('scream', myEventHandler1);

//Assign the event handler to an event:
eventEmitter.on('scream', myEventHandler2);

console.log("Listener(s) count: "+eventEmitter.listenersCount('scream');

//Fire the 'scream' event:
eventEmitter.emit('scream');

Output:

Listener(s) count: 2
I hear a scream 1!
I hear a scream 2!
true

PS: I understand event listeners are just a callback.

via Ayaz Pasha