List failed workitems from helth check ("nightly"):
daily number - how many % of :

number of failed TEST workitem / number of all TEST workitems per day

number of failed BUILD workitem / number of all BUILD workitems for given integration
:

what is understoo by day / 24h
date - would be the start
starts at 9 pm and finished around 12 pm next day
Oulu time? i

number (test workitens) != number (build worktimes)