Unfortunately the limited size of the veripool.org server prevent us from running an example server, but you can run a in-place server fairly easily. See Installing.
Instead, the following screenshots were taken from a production Metrigator system.
Below, Metrigator is installed along with CovVise to display the coverage statistics. In this example there are four coverage percentages displayed. From the top line down to the bottom line these are: low coverage for a random regression and low coverage for the nightly regressions, followed by ok coverage for random and nightly (although sometimes the nightly regression gets better coverage so is above). Also note the overview of several months on the panel at the left, complemented by the zoom in on the right panel.