I actually spent a lot of time on handling these 503's when I implemented sync in my app, and unless I'm missing something, I think my app is tolerating the recent instability really well.

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https://twitter.com/CraigGrannell/status/1485658382946213892

I AM seeing some recent spikes in underlying sync errors (see image), but it's not translating into failed overall syncs (which I also track but don't have good graphs for), and I have not had any reports of sync failures from users.