/org/freedesktop/DBus. Previously, they existed on all object paths.
(fd.o #101257, Simon McVittie)
+• AddMatch() with a match rule containing eavesdrop='true' will now fail
+ unless called by either the same user as the dbus-daemon, or Unix uid 0
+ (root), matching the restrictions applied to the newer BecomeMonitor()
+ method. On the session bus this has no practical effect. On the system
+ bus this will prevent certain configurations that already did not
+ work well in practice. (fd.o #101567, Simon McVittie)
+
Enhancements:
• D-Bus Specification version 0.31