Consider extracting the error checking logic from ClientPollerTimeBasedHealthCheck into generic kiwi utility

[sleberknight]

ClientPollerTimeBasedHealthCheck in dropwizard-client-poller contains some code to calculate the maximum number of allowed poll errors in a given time window. Consider making this generic, though not sure exactly where this would go in kiwi package-wise.

We might consider whether it's possible (or desirable) to also create a health check that encapsulates this concept of time-based error counting with an allowable threshold of errors.

So you would have:

• A utility that provides some basic calculations on allowed errors within a time period
• A reusable health check that allows you to provide some way to provide the time window, number of errors in the time window, and a threshold

If the health check isn't possible, just creating the utility would probably still be worthwhile.

References:

• https://github.com/kiwiproject/dropwizard-client-poller/blob/ac772c585af289a5b555e3b35817d245619498ff/src/main/java/org/kiwiproject/dropwizard/poller/health/ClientPollerTimeBasedHealthCheck.java#L292

[sleberknight]

Another thought is that we could make use of the AutoDrainingCounter in kiwi-beta somehow and maybe add that to kiwi as well as provide a health check around that concept too.