performance alerts: Debounce consecutive alerts

Main changes

• Make ministat script smart enough to ignore alerting when nothing changed since the last day (such as weekends).

• Added changes_since and minimum_changes parameters to help to define when the data should be fresh to trigger alerts.

• There is a debouncer which will use the before and after datasets, slice them into n parts, to simulate what would be the results from the past and only alert when there is enough (not more, not less) redundant data from the recent past.

Results

This snippet gallo/mesa-performance-tracking$7129 contains comparison against the baseline information about how many alerts are produced depending on the debouncer parameters.