stats - add queues: {name: size} info on /stat

[thapakazi]

This PR is for queue info addition on /stats endpoint.

Motivation

Faktory was missing the json stats endpoint about queues like in sidekiq.

Edit Jan 11: queues map is moved into /stats inside faktory.queues

$ curl -s http://localhost:7420/stats | jq .faktory.queues
{
  "app0": 87,
  "app1": 82,
  "app2": 73,
  "app3": 81,
  "app4": 76,
  "app5": 75,
  "app6": 75,
  "app7": 78,
  "app8": 71,
  "app9": 63,
  "default": 0
}

Remarks
Not sure if I should write test for this or change other files. The existing test are passing as usual 😁
Added test too :)

[mperham]

Perfect, thank you for adding a test. 👍

[mperham]

I'd rather you push this logic down into the Handler and not create a public API for it here.

[mperham]

In other words, move this code into statsQueueHandler.

[mperham]

I would instead suggest that you add these elements to server.CurrentState(), which is already does all of the hard work. I would add a new queues hash with name: size pairs within. WDYT?

[thapakazi]

Yeah sure 👍 one stat to get it all. I was just following up with that of sidekiq.
Will push new changes accordingly. Thanks

[thapakazi]

I have pushed the changes. please review.

btw, I have placed queues inside faktory like:

I mean this

{
  faktory: {
	default_size: 0,
	queues: {
	  app0: 1674,
	  app1: 13780,
	  app2: 13451,
	  app3: 13529,
	  app4: 13602,
	  app5: 13760,
	  app6: 13915,
	  app7: 13591,
	  app8: 13588,
	  app9: 13435,
	  default: 0
	},
	tasks: {
	  Busy: {
		reaped: 0,
		size: 5
	  },
	  Dead: {
		cycles: 4,
		enqueued: 0,
		size: 0,
		wall_time_sec: 0.000277531
	  },
	  Retries: {
		cycles: 49,
		enqueued: 0,
		size: 0,
		wall_time_sec: 0.005136246
	  },
	  Scheduled: {
		cycles: 49,
		enqueued: 0,
		size: 0,
		wall_time_sec: 0.011227027
	  },
	  Workers: {
		reaped: 0,
		size: 1
	  }
	},
	total_enqueued: 124325,
	total_failures: 0,
	total_processed: 12036,
	total_queues: 11
  },
  server: {
	command_count: 296863,
	connections: 50,
	faktory_version: "0.9.5",
	uptime: 248,
	used_memory_mb: "68 MB"
  },
  server_utc_time: "03:21:20 UTC"
}

Thanks :)