Post 6.17 upgrade satellite is affected with high CPU usage and lots of Actions::Katello::Applicability::Hosts::BulkGenerate tasks getting stuck. The satellite comes back to normal , once the tasks are cleaned up but that does not means, the issue is fixed. If anything again triggers a new Actions::Katello::Applicability::Hosts::BulkGenerate task for each host connected with satellite, The initial performance issue will repeat itself. 

Relevant upstream discussion: https://community.theforeman.org/t/slow-generate-applicability/43628 

Log shows several recurring  pg queries being done relevant to  a long list of modular packages and almost giving it the same vibe as https://projects.theforeman.org/issues/36850.