Specifies the adgroup the request context must match in order for
the feed item to be considered eligible for serving (aka the targeted adgroup).
E.g., if the below adgroup targeting is set to adgroup = X, then the feed
item can only serve under adgroup X.
Namespace
https://adwords.google.com/api/adwords/cm/v201809
Field
TargetingAdGroupId
xsd:long
The ID of the adgroup to target.
This field is read only and will be ignored when sent to the API for the following Operators: REMOVE.