1 Where IdealGraphVisualizer graph dumps triggered by Dump or DumpOnError should be written.
   2 The accepted values are:
   3       File - Dump IGV graphs to the local file system (see DumpPath).
   4    Network - Dump IGV graphs to the network destination specified by PrintGraphHost and PrintGraphPort.
   5              If a network connection cannot be opened, dumping falls back to file dumping. 
   6    Disable - Do not dump IGV graphs.