Use Peak Level Indicator: This will display a thin yellow line on the health graphs indicating the highest value recorded by the graph.

Reset Peak Level after a number of ticks: If this box is not checked, the Peak Level Indicator will be permanently positioned at the highest value ever recorded on the health graph. With this box checked, the Peak Value Indicator will be reset after a period of time indicated by the Time after the Peak level resets option. Use this option if you would like to know the peak level over an interval rather than the peak level overall.

Ticks after the Peak level resets: When the Reset Peak Level after a number of ticks option is set, this determines the amount of time (in ticks) that will pass before the Peak Level Indicator will be reset.