general/5140: Sporadic SIGHUP and SIGTERM error messages in /var/log/httpd/error_log

[Tom Sparks <ts...@nas.com>]

>Number:         5140
>Category:       general
>Synopsis:       Sporadic SIGHUP and SIGTERM error messages in /var/log/httpd/error_log
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          support
>Submitter-Id:   apache
>Arrival-Date:   Tue Oct 12 20:10:41 PDT 1999
>Last-Modified:
>Originator:     tsparks@nas.com
>Organization:
apache
>Release:        1.3.6
>Environment:
RedHat 6.1, php-3.0.12, MySql-3.22.24
uname -a:
Linux www.tsparks.com 2.2.10 #2 Wed Jul 21 18:20:02 PDT 1999 i586 unknown
Only application is IP_Masquerade...
>Description:
The message "caught SIGTERM, shutting down" and one second later, "resuming
normal operations".
and the message "SIGHUP received, attempting to restart" and one second later,
"configuring--resuming normal operations"
appear in my error_log(.1,2,3) files. No pattern in frequency.  Some at 4:02am
when there is no system activity.
Have checked FAQs and problem report database and could not find this reported.
It may be because this is normal!  I perused source "http_main.c" and do see
HUP and SIG mentioned several times, but I'm not sure if this is for debugging
purposes or it is normal for maintaining parent/child relationships.  
Question:
Do I need to worry about these errors...are they caused by an event or a person?

Thank you for your support!
>How-To-Repeat:

>Fix:

>Audit-Trail:
>Unformatted:
[In order for any reply to be added to the PR database, you need]
[to include <ap...@Apache.Org> in the Cc line and make sure the]
[subject line starts with the report component and number, with ]
[or without any 'Re:' prefixes (such as "general/1098:" or      ]
["Re: general/1098:").  If the subject doesn't match this       ]
[pattern, your message will be misfiled and ignored.  The       ]
["apbugs" address is not added to the Cc line of messages from  ]
[the database automatically because of the potential for mail   ]
[loops.  If you do not include this Cc, your reply may be ig-   ]
[nored unless you are responding to an explicit request from a  ]
[developer.  Reply only with text; DO NOT SEND ATTACHMENTS!     ]