The ‘Custom link’ dimension reports the names of custom links implemented on your site. This dimension is valuable when you want to understand the types of links visitors click the most.
This dimension collects data from the
pev2 query string in image requests for hits that also have the
pe query string with the value of
lnk_o. If the
pe query string has a different value in the hit, this dimension does not collect data.
If you want to send data to this dimension using AppMeasurement, send a
tl() image request with a link type argument of
"o". Populate the link name argument with the desired value.
Since this variable is based on a custom string in your implementation, your organization determines what the dimension items are. Adobe recommends that you group links into meaningful categories based on your reporting needs.