Description of problem:
I have a Satellite 6.13 system with PCP installed.

To monitor a few interesting processes, I have enabled hotproc:

1. cat /var/lib/pcp/pmdas/proc/hotproc.conf
   #pmdahotproc
   Version 1.0

(
fname == "java" ||
fname == "redis-server" ||
(fname == "postgres" && psargs ~ /-D/) ||
psargs ~ /puma/ ||
psargs ~ /pulpcore.app.wsgi:application/ ||
psargs ~ /pulpcore.content:server/ ||
psargs ~ /pulpcore-worker/ ||
psargs ~ /smart-proxy/
)

1. cat /var/lib/pcp/config/pmlogconf/foreman-hotproc/summary
   #pmlogconf-setup 2.0
   ident foreman hotproc metrics
   probe hotproc.control.config != "" ? include : exclude
   hotproc.psinfo.psargs
   hotproc.psinfo.cnswap
   hotproc.psinfo.nswap
   hotproc.psinfo.rss
   hotproc.psinfo.vsize
   hotproc.psinfo.cstime
   hotproc.psinfo.cutime
   hotproc.psinfo.stime
   hotproc.psinfo.utime
   hotproc.io.write_bytes
   hotproc.io.read_bytes
   hotproc.schedstat.cpu_time
   hotproc.fd.count

When I restart pmlogger on its own, it generates the following snippet in /var/lib/pcp/config/pmlogger/config.default:

#+ foreman-hotproc/summary:y:default:

1. 1. foreman hotproc metrics
      log advisory on default {
      hotproc.psinfo.psargs
      hotproc.psinfo.cnswap
      hotproc.psinfo.nswap
      hotproc.psinfo.rss
      hotproc.psinfo.vsize
      hotproc.psinfo.cstime
      hotproc.psinfo.cutime
      hotproc.psinfo.stime
      hotproc.psinfo.utime
      hotproc.io.write_bytes
      hotproc.io.read_bytes
      hotproc.schedstat.cpu_time
      hotproc.fd.count
      }
      #----

However, when I restart both pmcd and pmlogger together (`systemctl restart pmcd pmlogger`), I get:
#+ foreman-hotproc/summary:x::
#----

Thus no data is logged by pmlogger.

I could not trivially reproduce the issue on a different machine, so I assume it is some race condition where pmcd did not yet have properly initialized hotproc.control.config and pmlogger thinks it is not set and drops the include.

Version-Release number of selected component (if applicable):
pcp-5.3.7-16.el8.x86_64

How reproducible:
100% on one machine
0% on another ;/

Steps to Reproduce:
1. have a "loaded" pmcd with hotproc
2. systemctl restart pmcd pmlogger

Actual results:
pmlogger does not include configuration as it thinks hotproc.control.config is empty

Expected results:
pmlogger includes the config correctly

Additional info: