The 'connection-monitor-preview' extension version 0.1.0 is not compatible with your current CLI core version 2.60.0.
This extension requires a min of 2.0.80 and max of 2.0.82 CLI core.
Please run 'az upgrade' to upgrade to a compatible version.
Any pointers as to how I can get rid of this message? (declaratively;)
I think you are looking for a downgrade. The extension seems to specify that they are looking for a version of the cli between 2.0.80 and 2.0.82, while the azure cli is at 2.60.0 (although I sure missed that this was a downgrade while skimming the first time too).
The best course of action would probably be to ask upstream to update their plugin, or try to do it yourself. Alternatively, you could also use an old version of nixpkgs to downgrade your azure cli. Hereโs a link to installation instructions for 2.0.80: