The Cloud Services team is in the process of updating and standardizing the use of DNS names throughout Cloud VPS projects and infrastructure, including the Toolforge project. A lot of this has to do with reducing our reliance on the badly-overloaded term 'Labs' in favor of the 'Cloud' naming scheme. The whole story can be found on this Wikitech proposal page. These changes will be trickling out over the coming weeks or months, but one change you might notice already.
New private domain for VPS instances
For several years virtual machines have been created with two internal DNS entries: <hostname>.eqiad.wmflabs and <hostname>.<project>.eqiad.wmflabs. As of today, hosts can also be found in a third place: <hostname>.<project>.eqiad1.wikimedia.cloud. There's no current timeline to phase out the old names, but the new names are now the preferred/official internal names. Reverse DNS lookups on a instance's IP address will return the new name, and many other internal cloud services (for example Puppet) will start using the new names for newly-created VMs.
Eventually the non-standard .wmflabs top level domain will be phased out, so you should start retraining your fingers and updating your .ssh/config today.