openSUSE admin

Checking whether to refresh metadata for Update repository of openSUSE Backports
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  Repository:       Update repository of openSUSE Backports
  Key Fingerprint:  637B 32FF 3D83 F07A 7AE1 C40A 9C21 4D40 6517 6565
  Key Name:         openSUSE:Backports OBS Project <openSUSE:Backports@build.opensuse.org>
  Key Algorithm:    RSA 2048
  Key Created:      Fri Nov 26 14:26:23 2021
  Key Expires:      Sun Feb  4 14:26:23 2024
  Rpm Name:         gpg-pubkey-65176565-61a0ee8f
Retrieving: e36992771cbad648e2ec147893ad7dcfb250bebde715ea060c7ecc5eba1acf2d-deltainfo.xml.gz .........................................................................................................................................[not found]
Retrieving repository 'Update repository of openSUSE Backports' metadata ..................................................................................................................................................................[error]
Repository 'Update repository of openSUSE Backports' is invalid.
[repo-backports-update|http://download.opensuse.org/update/leap/15.4/backports/] Valid metadata not found at specified URL
History:
 - File './repodata/e36992771cbad648e2ec147893ad7dcfb250bebde715ea060c7ecc5eba1acf2d-deltainfo.xml.gz' not found on medium 'http://download.opensuse.org/update/leap/15.4/backports/'
 - Can't provide ./repodata/e36992771cbad648e2ec147893ad7dcfb250bebde715ea060c7ecc5eba1acf2d-deltainfo.xml.gz

Please check if the URIs defined for this repository are pointing to a valid repository.
Skipping repository 'Update repository of openSUSE Backports' because of the above error.

Only downloadcontent.o.o and mirror.linux-schulserver.de serve this file, other DE mirrors return 404.

15.5 is broken in the same way, just a different -deltainfo.xml.gz file.