I don’t think the fetchers are the real problem here. More important is the “cmk --create-rrd” this can correspond to the RAW edition problem with process_perfdata there.
Booth editions have problems to write all the data to RRDs or to create RRDs.
This doesn’t seem to be a coincidence.
The fetcher “storm” looks like the CMC core has now the bad scheduling inherited from the classic Nagios core 