The disqus.changed.* namespace family is populated when an interaction represents an update. You can regard this namespace family as a change log.
The previous is_flagged status prior to an update. Allowed values are:
- Filter for all comments that have been flaged by users that relate to posts about Canada:
disqus.changed.is_flagged == 1 and disqus.message contains "Canada"
Target service: Disqus