I will be starting the upgrade to v2.9.0 for all Mastodon instances hosted on Masto.host.
There should be less than 1 minute of downtime.
You can read about the release here: https://blog.joinmastodon.org/2019/06/mastodon-2.9/ or the changelog here: https://github.com/tootsuite/mastodon/releases/tag/v2.9.0
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