How to stop synchronization of repository to reduce the load of RHUA?

Solution In Progress - Updated -

Issue

The following repositories are not updated by EOL. However, RHUA continues to perform synchronization tasks.
There are clients that utilize these repositories, so they do not delete these repositories.
How to stop synchronization of repository to reduce the load of RHUA?

・rhel-5-server-rhui-rpms-5Server-x86_64
・rhel-6-server-rhui-rpms-6Server-x86_64
・rhel-6-server-rhui-optional-rpms-6Server-x86_64

Environment

Red Hat Update Infrastructure 3.1

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