> not scalable

Yeah sharding it is a pain. We got its to a million active metrics (ie a metric that was updated in the last 5 mins) on a single instance, with the wisper backend.

I suspect the newer DB based backend are better scalability wise.

> no labels, so you must flatten them into a metric name

I _personally_ don't like labels, I believe that metrics should be one dimensional. I know that puts me at odds with others. I can see the appeal as it allows you too easier group instance metrics into service level ones.