Can recommend Uptime Kuma for this purpose: https://github.com/louislam/uptime-kuma
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I actually have exactly this, paired with ntfy. I was thinking more like badges: "was up during AWS outage in 2025" etc.
Uptime Kuma already has some automatically generated badges[1], but not for specific events. Your could manually built your own custom ones based on the same framework[2] though.
Where would you put it? :) (I have one on the oracle free tier)
I just selfhost it, but that has the disadvantage that it also went out during my ISP's and Cloudflares outage. ;)