[Satellite6] How to identify clients where a bulk package/errata install via katello-agent failed?

Solution Verified - Updated 2017-01-23T10:06:36+00:00 -

Issue

Installing/upgrading a package or applying an errata to a list of Content Hosts via katello-agent (not via Remote Execution)
Some subtasks failed / some systems were not updated
How to identify what systems fail to be updated?

Red Hat Satellite 6

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