add peak message sizes to Stats interface
Submitted by Simon McVittie
Assigned to D-Bus Maintainers
+++ This bug was initially created as a clone of Bug #33757 +++
This branch adds a Stats interface. It doesn't yet solve Bug #24307 (it doesn't include the actual match rules), but it does include various potentially-interesting numbers.
In the longer term Colin wants such things to be on a secondary /var/run/dbus/system_bus_management_socket or some such, but splitting off interfaces now seems like a good start on that.