Description of problem: the config file tries to load the rrdtool plugin, which is either not required nor installed. Version-Release number of selected component (if applicable): -5.7.2-1.1.el7ost.x86_64
collectd.conf file also misses at the end Include "/etc/collectd.d"
OSP11 is now retired, see details at https://access.redhat.com/errata/product/191/ver=11/rhel---7/x86_64/RHBA-2018:1828