[QA] PromQL subtraction operator is not right?

[songjiayang]

What did you do?

I use PromQL to check my service code, I just want to known whether there is 4xx expect 400 / 419 case.

Query like screenshot:

What did you expect to see?

• no value smaller than 0.

What did you see instead? Under which circumstances?

• some value smaller than 0

Environment

• System information:

• Ubuntu 14.04

• Prometheus version:

• v 1.4.1

I known there is a better query for my case , but I want to known what's the problem for my current query.

[brian-brazil]

That looks like floating point inaccuracy.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.