When using the apache status "protocol" test, open/unused worker slots should be included when calculating the percentages. In many cases not doing so doesn't seem terribly useful to me.
For example, say that at a given time I have 5 active workers out of a total of 256 open slots, and that I have specified I want to be alerted when >60% of workers are writing. Well, now I will be alerted when 4 out of the current 5 workers are writing at a given moment in time. Considering I have 251 available worker slots that could be used this alert is not going to be very useful.
Should this behavior of ignoring open slots be changed? It wouldn't be terribly difficult to code but it does represent a breaking behavior change.