Yep, octodon.social is down as of this Timestamp.
admin @CobaltVelvet has a toot about it at mastodon.social.
It's due to a Scaleway server issue described here:
You can find more information and chat about it under the #octodon tag (obviously)
Yes, Octodon is down, and it's 100% because of Scaleway. Don't worry too much, it should be back up as soon as they fix their shit, with nothing lost. And we're moving out soon.