Is there a create dummy data in a splunk vm environment to test creations of dashboards, reports and alerts?
SimData is also a great option.
https://dev.splunk.com/enterprise/docs/dataapps/simdata/
See this https://splunkbase.splunk.com/app/1924/
and https://docs.splunk.com/Documentation/SplunkCloud/6.6.3/SearchReference/Makeresults