Warning state

[mikehale]

In nagios we currently have many checks with warning and critical thresholds. Currently umpire only provides a way to check for ok vs not-ok states. Does it make sense to provide a way to define warning thresholds and return a distinct http response code in that case?

[gorsuch]

I think we'll close this issue out for similar reasons to #5 - this tool is largely intended to be used with Pingdom, and that tool doesn't really deal with nuanced responses. Please re-open if you want to explore this further, though!