Investigate the grafana dashboards not showing metrics for pages

From a recent slack message:

Hi team I noticed some metrics are not available in Grafana for recent test runs using the new sitespeed-runway setup.For example, the Grafana dashboard (SourceCode_File_Blame_Large page) shows a screenshot and video of the page loading, but none of the metrics are available on the dashboard.Is this known? /cc @Nivetha