There is a response in the bug to the messages. Some of the messages are because I have dolphin installed for some testing (where the system has Gnome Desktop).
The interesting part is below. Should we recommend changing our dbus configuration file in our distribution?
Eavesdrop is a D-Bus feature that was superseded by monitors. dbus-broker does not implemented eavesdropping, but your D-Bus configuration file still enables it. This message tells you that eavesdropping-configurations will be ignored.
This is likely because your distribution ships the dbus configuration file from the reference implementation. This still contains eavesdrop configurations, even though the feature has not been used for many years.