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Actions::Katello::Host::GenerateApplicability is one the most used actions in the foreman tasks/dynflow queue. 
An example of a user who had 700,000 tasks in their task history saw this rough breakdown

COUNT|TYPE 
277923 Actions::Katello::Host::GenerateApplicability

we need to investigate moving this to be handled directly by the main Rails application and not require the overhead of task creation, monitoring and eventual database cleanup.

*** This bug has been marked as a duplicate of bug 1771724 ***