Tracks memory pool stats (eden, survivor, tenured, etc.)

[bdarfler]

This, along with #18 closes #17

[bdarfler]

Question about this. There is also a type field to denote on/off heap which I didn't use since I wasn't sure how to best add that to the metric name. It would be nice to support graph all pools of the same type together on one graph. Would it be best to have the metric name be type.name to support this? I'm still new to best practices around statsd naming.

[ajsquared]

What do you think of having the metrics like heap.total, heap.eden, etc and group them that way?

Doing this would require some changes to the dashboard, but that should be pretty straightforward.

[bdarfler]

Also I believe there could be spaces in the pool names. Is it best to replace them with a hyphen?

[ajsquared]

Yeah, replacing the spaces with hyphens is good.

[bdarfler]

Ah so you mean like:

heap.total.{init, used, committed, max}
heap.eden.{init, used, committed, max}

I like that.

[ajsquared]

Yeah, those metric names look good.

[bdarfler]

Ok I updated the metric names and I took a crack at fixing the visualizer. Let me know if I missed anything.

[ajsquared]

Looks great, thanks again for this!