what is the difference between filter for Facet Value is X and Source Name is X as filters in reports?
My understanding of using the Facet Value is X seems to be when X has been selected as a filter, this will be included in the report.
what exactly is the difference between using Facet Value is X and Source Name is X?
For example, when I am looking at activities, such as queries: When I specify that Source Name is Knowledge, I get 356 queries. When I specify that Facet Value is Knowledge I get 123 queries, for the same period of time.
When I use Facet Value, I see has clicks as true and false - both exist and show up. When I use Source Name, I see has clicks is always 100%.
Those two are different dimensions. The Facet Value is a custom dimension and can be pushed in any type of events. Note that if a facet was not used, there will be no facet value. The source name is a dimension that is only available on clicks, so it is normal that the has clicks is always 100%.
For more information on the available dimension, please refer to the online help.