Pareto plug-in could be used for monitoring tag values with accumulating them (it means that on the Pareto graph will be shown distribution of the tag values keeping in mind all previous values).

In the picture below is shown Pass / Fail / Undefined distribution on Pareto graph after some time running (accumulating, tags with logic values are attached to the plug-in):

Also using Pareto graph static values of the tags could be monitored. This means that values from tags are taken and showed proportionally on the graph.

In the picture below is shown distribution of the products (static type - on the attached tags products count are stored):