We have two hosts in eqiad (mw1297 and mw1298) and four hosts in codfw (mw2150, mw2151, mw2244 and mw2245) which were formerly used as image scalers. When the current HHVM/stretch migration (and ideally the merge of job runners/video scalers) is completed, we can repurpose them for other mw* roles (and since they are currently unused, maybe also use the opportunity to move them to other racks if that helps balancing rows).
[x] mw1297 reinstalled
[ ] mw1297 reallocated -> API
[x] mw1298 reinstalled
[ ] mw1298 reallocated -> API
[x] mw2151 reinstalled (was jessie unlike others)
[x] mw2151 reallocated -> jobrunner, ] mw2151 reallocated -> jobrunner,added to conftool after it was missing not in conftool yet
[x] mw2244 reinstalled
[ ] mw2244 reallocated -> ?
[x] mw2245 reinstalled
[ ] mw2245 reallocated -> reserved for thumbor (T218323)