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Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.
If it's a critical production server (where downtime is not an option) then don't upgrade now ..(you can do that when you are sure of 5hrs of less to no traffic on your server)
I say this because, plesk's upgrade stability is unpredictable ..(while others experience a smooth and clean upgrade, others end up with broken servers and there is no systematic formula as of the cause)
You may also want to try using Parallels Plesk Panel Pre-Upgrade Checker: A tool to identify business logic issues before upgrade or migration