The point is: what constitutes a "measurement"? A data point for each metric I submit? Or can I send data points for multiple metrics in a batch, is this considered a single "measurement"? I have no idea, and the support page doesn't cover that. That means, if I can't word it clearly to my financial department, they won't subscribe.

Appreciate the feedback (librato co-founder here), we should definitely make that clearer on the pricing page and elsewhere. We're in the process of adding some content around that now.

In short a measurement is a single datapoint i.e. <key, value, timestamp>. So if you have a sense of how many metrics you want to track and at what frequency, it's relatively straight-forward to calculate the list price. There's an estimator on the pricing page to help you do that once you understand what constitutes a "measurement".

Is that price competitive? I only looked at stat-hat recently, and for whatever reason their pricing seemed more reasonable. Perhaps it was just how they pitch it, as units by the million.

That said, librato seems like it would be nice if your stat volume was low.

I think it's definitely competitive if you look across all the entrants in this space (or similar/adjacent) ones. That doesn't necessarily make us the lowest priced however ;-). Roughly speaking a million measurements costs $2.00 with our current list pricing. We do have progressive volume discounts (described in the FAQ) that kick in at higher measurement counts.