Memory usage keeps growing
I'm currently logged in for 108 days and over that time I observed a very slow creep of xfce4-session memory usage over each day. At the current time, it takes up 4GB of memory! So akin to 40 MB per day.
It looks like a memory leak to me, which forces me to reboot the system sometime in the future. Unfortunately, I don't have any more information on this and I'm not running a debug version, so I doubt I could glean anything useful from it with a memory dump.
I'm completely guessing at this point but it could be something trivial like some internal memory-held log growing over time. I had a similar problem with the .xsession-errors files in the past because pidgin keeps spamming Json-CRITICAL "warnings". Currently, .xsession-errors is 45MB large, which is still ok. Xfce4-session is "only" mentioned about 4000 times with (the Pidgin log line appears 380k times):
(xfce4-session:14089): xfce4-session-WARNING **: 01:10:58.993: ICE connection 0x56327fb692f0 rejectedand 5 times
(xfce4-session:14089): GLib-WARNING **: 19:10:20.560: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). See the documentation of g_child_watch_source_new() for possible causes.