Add percentages in label that pops out when hovering on graphs

[V0LDY]

Suggestion for a small QoL improvement, It would be nice to have the exact percentage of the selected parameter when hovering the mouse over the queries stats graphs, kinda like PiHole does.

[ShreyasZare]

Thanks for the suggestion. The chart library used here does no have this option. So it can show either the absolute numbers or percentage.