Problem: When adding a new monitor, overall uptime goes down proportionally to the number of monitors:
Expected result: Overall uptime remains the same, regardless of number of new monitoris added.
Motivation: Overall uptime has not actually decreased when a new monitor is added. Monitors may come and go, but overall uptime should not be affected by the number of monitors.
Example: When I added a new monitor to my two previous monitors, overall uptime went down from 100 % to 66%
Remedy: Calculate overall uptime based on date of creation of the monitors and state, not only on the reporting time window.