  The ALICE muon spectrometer studies the production of quarkonia and open
heavy- flavour particles. It is equipped with a Trigger System composed of
Resistive Plate Chambers which, by applying a transverse-momentum-based muon
selection, minimises the background from light-hadron decays. The system has
been continuously taking data throughout the LHC Run I; it has undergone
maintenance and consolidation operations during the LHC shutdown period 1. In
the first year of the LHC Run II, the system, fully recommissioned, has
participated in data taking in pp and Pb/en-dashPb collisions. The performance
of the system throughout the last data-taking period is presented.
