Updates for folks following this thread:
We are migrating the following repos, today, September 20th, between the window of 3-4pm PT / 10-11pm UTC.
/swift-foundation
/swift-foundation-icu
/swift-corelibs-foundation
We are expecting all three repos to be down for activities (pushing, pulling, merging, etc) for the duration of that window. I'll circle back after we have completed various milestones.