Provide the ability to easily see module (link) CTR

REQUESTED CHANGE:

Provide the ability to easily see module (link) CTR.  We want see the calculated metric provided in list format for multiple line items or trended, like any other calculated metric.

CURRENT FUNCTIONALITY:

We currently track most links on our site using some traffic variables. They can be served dynamically so sometimes they are on the page and sometimes not (and we're doing more and more dynamic serving).

To track impressions we have used several approaches, inlcuding ad-hoc callse for impressions (expensive) and a concatinated string into a list prop (string length issues, no correlations). Not very robust.