The LogicalSession dashboard leverage one of the vpxd-profiler statistic counters logged in vpxd-profiler.log file.
Vpxd::Session::LogicalSession counter helps you track the vCenter server active & idle connexions limited by the maxSessionCount vpxd.cfg parameter.
In the following screenshot you can observe vCenter connections during backup window. This dashboard actually helped troubleshooting a real backup jobs scheduling issue as the default maximum session count was reached sometimes.
This dashboard is actually a template and needs a bit of configuration. You need to replace the vCenter names by yours.