Sites down with 503 Service Unavailable with PHP pool page giving an internal server error

MikeRoetgers marked all old repositories as private, so this breaks Composer. It’s fixed in 3.2.49, which makes me suspect you were on edge-major. Patch releases (3.2.48.x to 3.2.48.y) shouldn’t trigger a reversion to major… also likely what prompted your other query.

cpcmd scope:set cp.update-policy edge-major
upcp

Give that a whirl.