[jiehong]

Also, 0.1% of users seems small, but looking at the actual number of users this represents is more important.

> web application that serves hundreds of thousands of requests every day

So in this case, that's at least hundreds of requests per day. I mean, it's not small.

I agree completely with this comment, and another comment saying that "which percent contains the value of the product", because that might be the most important 0.1%.