I'm debating whether we should cache all requests or just this one.  This is really the only one that racks up lots of calls against the rate limit, and if its 5 mins outdated it would be hard to notice.

I think the others would be hard to notice in *most* cases, but if someone immediately wanted to look at a bunch of milestones they just created they would have to wait - and they might not know why.  

I'm leaning towards only caching this endpoint.  Thoughts?