Great question — answering as the UphillTech team:
One thing I noticed is that they have indexed the non-www version of your homepage, even though that redirects. Have you changed canonical URLs recently? I can see 3 www pages and the homepage currently in their index with a site: search. If you had no pages at all indexed 6 days ago, that just suggests they are being a bit slow in adding them. Google have also been doing a lot of "low quality content" updates of late, so some pages may have been hit by that and it may be nothing to do with your downtime at all. However, the non-www homepage suggests to me that they either haven't crawled the site for a while (GSC can tell you when they last crawled) or are still updating things after a...
Full answer by RichardB: https://webmasters.stackexchange.com/a/148753 (CC BY-SA 4.0).
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