I've wanted a badge that shows the instance uptime and couldn't find any, so I created one. It's available at https://uptime.lemmings.world/{your-domain}.svg and gets its data from fediverse.observer.
Examples:
- Lemmings.world:
- https://uptime.lemmings.world/lemmings.world.svg - Lemmy.world:
- https://uptime.lemmings.world/lemmy.world.svg - Lemmy.ml:
- https://uptime.lemmings.world/lemmy.ml.svg - discuss.tchncs.de:
- https://uptime.lemmings.world/discuss.tchncs.de.svg (congrats on that uptime, by the way!) - and so on
The documentation is available at https://uptime.lemmings.world. Feel free to use it for your instance if you wish to.