Weird nagios checks added after install

Have just installed grafana and noticed that I don't have a /etc/nagios/nrpe.d/check_grafana-server.cfg file, but I do have all of these:

check_a.cfg
check_-.cfg
check_e.cfg
check_f.cfg
check_g.cfg
check_n.cfg
check_r.cfg
check_s.cfg
check_v.cfg

which I can't help noticing looks very much like all the individual letters from "grafana-server", so I suspect a string is being split somewhere it shouldn't, most probably in the nrpe.add_init_service_checks() call.