Not sure if anyone else is also seeing this, but I have been getting out-of-date repository warnings for the past day or so:
Rockstor:~ # zypper up --no-recommends
Loading repository data…
Warning: Repository ‘Leap_15_3_Updates’ appears to be outdated. Consider using a different mirror or server.
Reading installed packages…
The following 3 package updates will NOT be installed:
dracut-kiwi-lib dracut-kiwi-oem-dump dracut-kiwi-oem-repart
Nothing to do.