The Library Health field in the Volume List Properties Window displays a score out of 100, measuring the health of the selected Customer's Media Type.
The following list of items will deduct from a perfect Library Health Score:
The Library Statistics display, on a per Repository basis, the total Volumes, number of Volumes moving in and out, minimum of Scratch Volumes required and the number of Scratch Volumes present.
Media Types can be excluded from Health Check Statistics through Media Properties Option tab.