[phosphor-logging] About the "Stop emitting Entry propChanged before ifacesAdded" change reason

[CS20 CHMa0]

Hi Matt,
I meet an issue in bmcweb while update service handle firmware update error
https://github.com/openbmc/bmcweb/blob/master/redfish-core/lib/update_service.hpp#L321

After I  revert the change or try to change the match rule from 'PropertiesChanged' to 'InterfacesAdded',
the error handler work well in update service.
     fwUpdateErrorMatcher = std::make_unique<sdbusplus::bus::match::match>(
         *crow::connections::systemBus,
-        "type='signal',member='PropertiesChanged',path_namespace='/xyz/"
-        "openbmc_project/logging/entry',"
-        "arg0='xyz.openbmc_project.Logging.Entry'",
+        "interface='org.freedesktop.DBus.ObjectManager',type='signal',"
+        "member='InterfacesAdded',"
+        "path='/xyz/openbmc_project/logging'",

May I ask the reason why you update the change?  https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-logging/+/46055


Thanks
Brian
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