Yep, remote builds are working again. Connecting to the remote builder is slow, but it does happen eventually and proceeds from there.
I still get a little downtime, even with a bluegreen deploy (I tried default, canary, and now bluegreen to see if it helps) but that is a separate issue (how do fly.io deploys work?). I have seen some bonus errors in the logs which seem new though:
error.message="Internal problem" 2022-01-01T20:04:44.504 proxy[fde84576] lhr [error]error.code=2
error.message="Internal problem" 2022-01-01T20:04:46.614 proxy[c0d00137] cdg [error]error.code=2
error.message="Internal problem" 2022-01-01T20:04:51.589 proxy[fde84576] lhr [error]error.code=2
error.message="Internal problem" 2022-01-01T20:04:55.427 proxy[c0d00137] cdg [error]error.code=2
error.message="Internal problem" 2022-01-01T20:05:00.324 proxy[fde84576] lhr [error]error.code=2
But then they go away. Ah well, it’s working now.