We were seeing apt warnings during puppet on ores-compute-01.ores.eqiad.wmflabs,

W: Failed to fetch http://ores-misc-01.ores.eqiad.wmflabs/repo/dists/jessie-ores/Release.gpg Could not resolve 'ores-misc-01.ores.eqiad.wmflabs'

and another failure that I temporarily, manually resolved due to poor judgment, ores-compute-01 was unable to do any apt operations until I allowed it to downgrade from ldap-utils 2.4.44 (backports) to 2.4.41 (wmf).

The current guess is that the ores-misc apt source repo is cruft from a past experiment, and should be removed.