Downloaded and installed mate-applets{,-common}-1.24 and forced a reload
of the applet. The log file has stopped filling with these two lines.
The lines are still printed when using System Monitor (1.20) but I can
live with that as it's not repeated endlessly.
Fixed in Focal+.
** Summary
This should be fixed in version 1.24.0 (Focal).
https://github.com/mate-desktop/mate-
applets/commit/736ba510c9d5c55ca5a3a59693ce25fba010ad03
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https://bugs.launchpad.net/bugs/1872304
And I've just discovered that my systemd user journal is 112 MB. Filling
with this nonsense every two seconds. I'm sure it's doing wonders for my
SSD.
I dread to think what would happen if I had multiple users logged in.
** Bug watch added: github.com/mate-desktop/mate-applets/issues #230