Highest peak ratio(3.2.3)

The biggest spike-to-baseline ratio observed over each project's whole recorded history -- for example, "5.2x the recent average". A useful at-a-glance read on the most extreme outlier. The average covers complete days only. The day in progress is shown in the totals but does not enter the average. This card is deliberately not bound to the date filter: it is a lifetime worst-case, so an extreme spike stays on the record after it leaves the selected range. The other cards beside it do follow the filter.