The standard way to label data in Splunk is to use the sourcetype field, with a sourcetype setting in your monitor stanza:
[monitor:///var/log/glassfish]
sourcetype=glassfish
source , sourcetype and host are all fields that can be tagged like any other in Splunk
You can customise the dashboard by editing the XML for the dashboard_live to change the summary page. For example, you could replace the search with a query using the rest command to get a list of tags, like so : | rest /services/saved/tags count=0 | search field_name_value=host* | rename tag_name as tag | fields tag . I'm not sure that I'd recommend this though.
You can't delete sources or sourcetypes as these are metadata about the indexed events. However you can alias sourcetypes to a new name.
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