I will be starting the upgrade to Mastodon v4.3.0 on Masto.host.
This is a large upgrade and I will need to monitor the infrastructure while it is being deployed. So, it can take a while to reach every instance on Masto.host.
You can expect a couple of minutes of downtime during the upgrade.
Changelog: https://github.com/mastodon/mastodon/releases/tag/v4.3.0