All my servers are showing this today:

/etc/cron.daily/0yum-daily.cron:

Update notice SLEA-2017:1977-1 (from sl-security) is broken, or a bad duplicate, skipping.
You should report this problem to the owner of the sl-security repository.
If you are the owner, consider re-running the same command with --verbose to see the exact data that caused the conflict.


Cheers
Bill Maidment