Description of problem: collectd 5.8.1 was released, and it includes some substantial bug fixes. see https://collectd.org/wiki/index.php/Version_5.8 , lower half. https://review.rdoproject.org/r/#/c/17081/
According to our records, this should be resolved by collectd-5.8.1-2.el7ost. This build is available now.
collectd sanity done with collectd-5.8.1-2.el7ost.x86_64