Hi,

How about:

 elogind - Enable session tracking via sys-auth/elogind

Currently used by 12 packages, one more coming soonish:

 local:elogind:app-admin/packagekit-base: Enable elogind support to get user session
 local:elogind:gnome-base/gnome-settings-daemon: Rely on sys-auth/elogind as runtime logind provider
 local:elogind:gnome-base/gnome-shell: Use sys-auth/elogind for session tracking and suspend support.
 local:elogind:gnome-base/gvfs: Use sys-auth/elogind for session tracking.
 local:elogind:net-misc/networkmanager: Use sys-auth/elogind for session tracking
 local:elogind:sys-apps/accountsservice: Use sys-auth/elogind instead of sys-auth/consolekit for session tracking
 local:elogind:sys-apps/dbus: Use sys-auth/elogind for session tracking.
 local:elogind:sys-auth/pambase: Use pam_elogind module to register user sessions with elogind.
 local:elogind:sys-auth/polkit: Use sys-auth/elogind instead of sys-auth/consolekit for session tracking
 local:elogind:sys-fs/udisks: Use sys-auth/elogind for session tracking
 local:elogind:sys-process/procps: Use sys-auth/elogind for session tracking.
 local:elogind:x11-misc/sddm: Use sys-auth/elogind for session tracking.

-- 
Best regards,
Michał Górny