uri is the field in the example search partial_uri is the field I created that is a shortened form of uri The <fields> statement is one that restricts the visible fields in the table to only the date and the partial uri The $row.uri$ is how the clicked drilldown accesses the (non visible) uri field in the table and assigns it to the uri token Tokens are of the form $name$, so $uri$ is a token called uri and it is assigned the contents of the uri field from the search in the drilldown section of the dashboard when it does the set token statement. Have a read of this, as it will make things clearer (hopefully :)) https://docs.splunk.com/Documentation/Splunk/8.0.4/Viz/PanelreferenceforSimplifiedXML
... View more