https://www.dynatrace.com/support/help/how-to-use-dynatrace/networks/how-to-monitor-network-communic... -> look here:
Connectivity Percentage of properly established TCP connections compared to TCP connections that were refused or timed out.
Note: The Connectivity measure can be used as an indicator of whether there's network traffic on a host. Note, however, that 0% connectivity doesn't necessarily indicate that there is a problem with a host. Assuming no TCP errors are present, it may simply mean that no users have attempted to connect to the host process during the selected timeframe.
Information from documentation.
Sebastian
