(Also: hey CanaryWatch peeps, https://canarywatch.org/, I know you're brand new and the archive would not have gone back far enough, but note that keeping a database of earlier canaries would be a very neat feature, for this exact situation.)
That's a good suggestion, but if canarywatch provides too much information, could it also be vulnerable to NSLs etc.? (A cursory review of the site did not uncover a canary, but I could be overlooking something. Still, if any site would make this obvious...)
https://news.ycombinator.com/item?id=8796307
(Also: hey CanaryWatch peeps, https://canarywatch.org/, I know you're brand new and the archive would not have gone back far enough, but note that keeping a database of earlier canaries would be a very neat feature, for this exact situation.)