Open thread border router. Unable to update to 2.10.0
This most likely was an intermittent issue. When we publish the new metadata, it takes a while for the add-on to be built.
Did you try again updating since then?
And once it is built it also needs to be synced on the Github CDN (Content Delivery Network) for all servers around the world to be able to provide it for download.
If you are one of the first to get the update notice in HA, then your GitHub CDN node might not have been updated yet.
This is usually solved by waiting a bit and then try again, like 30-60 minutes (Sometimes it goes all wrong though and can take a day to get in sync).
Build time depends add-on and a bit on architecture (amd64/x86-64 is usually faster than amd64).
But as for CDN…
…is it really that bad? Absent of outages, I’d expect this to be quite intsant. I’d expect that a sync across regions will be made on demand if a locally not existing image is being pulled.
I think the larger projects on GitHub is pushed through the CDN and not pulled and HA is definitely large. 
The push is probably a lot faster than 30-60 minutes, but I can’t say if it is 1 minute, 2 minutes or 10 minutes, so 30-60 minutes will nearly always be a success. It is a question about setting the expectations of the user. 
I have tried the outage of a few days too, but I think that have mainly been with smaller projects, like HACS integrations.
Suddenly it worked…
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