I've forwarded it upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=423676
** Changed in: gnome-applets (upstream)
Importance: Undecided => Unknown
Bugwatch: None => GNOME Bug Tracker #423676
Status: Unconfirmed => Unknown
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multiload applet tooltip does not refresh
https://launchpad.net/bugs/97190