[Asterisk-Users] HUP signal?

[Rich Adamson]

Noticed the following on the CLI:

Received HUP signal -- Reloading configs
  == Parsing '/etc/asterisk/extconfig.conf': Found
  == Parsing '/etc/asterisk/manager.conf': Found
  <snip>

How do I track down the source of the HUP?

There are no indications in any log files and I do not have any
cron entries for * (RHv9).

Is asterisk doing this for some reason via internal code?