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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.
I just do not understand the reason for this but the plesk panel is very slow. Which is strange considering that all of my websites are fast uploading.
I discovered the cause of the problem.
RAM consumption was very high due to MariaDB 10.2. Usage reached peak, about 95% and this made my panel run slow and unavailable. I rebooted and fixed.
I am monitoring memory usage and so far everything is normal. If consumption increases I will analyze MariaDB processes better. I am currently using MariaDB 10.1. I installed following the official Plesk documentation.