Exposing queue/task size metrics

[ManojBhamsagar-Draup]

Hi, I'm are using puppeteer-cluster at large scale. Currently I'm facing issue in scaling the service. The load balancer routes requests to puppeteer service which is running puppeteer-cluster in a containerised environment. We already have the incoming requests info we can easily scale the service if we can get the current load. So if I can get the current number of tasks an instance is serving, I can use that factor in scaling the instances.

Since jobQueue is a private variable I can't access how many tasks are running at any given time.