Quieter logging

[tsumaru720]

Could be good to have an option to suppress some of the log output

for example, only show checks that change the fall/recover counters + alerts - rather than every check

[csmith]

Probably won't be an option, but will get rid of the check output at some point once that code is stable and working well

[csmith]

I've done a complete 180 on my thinking and added a flag.

[csmith]

09c3b4f