With https://gerrit.wikimedia.org/r/#/c/39056/ we renamed the old $realm to $wmfRealm. Tim mentioned:
It should be $wmgRealm, for consistency with other globals.
wmg = Wikimedia global, wmf = Wikimedia function.
We probably want to do that after the EQIAD migration though.
We can find them in operations/mediawiki-config with:
git grep -h -o -P '\$wmf.+?\b'|sort|uniq -c|sort -rn
As of Feb 4th 2020 we had:
57 $wmfConfigDir 53 $wmfRealm 36 $wmfAllServices 34 $wmfSwiftConfig 32 $wmfDatacenter 24 $wmfLocalServices 22 $wmfMasterDatacenter 15 $wmfHostnames 13 $wmfStandardAutoPromote 11 $wmfDbconfigFromEtcd 10 $wmfUdp2logDest 6 $wmfSwiftShardLocal 6 $wmfServiceConfig 5 $wmfSwiftShardCommon 5 $wmfPhabricatorApiToken 4 $wmfMasterServices 4 $wmfGerritApiUser 4 $wmfGerritApiPassword 3 $wmfSwiftBigWikis 3 $wmfEtcdLastModifiedIndex 1 $wmfUseRestbaseVRS