SJSWS7.0u8 use local hostname in logs

Question

I am trying to add the local host name into my access and error log files, in Sun Web Server 7.0u8, in two ways:
1. Add the local host name as part of the log file name on disk
2. Add the local host name into the custom log format of the access log.
Considering I have a cluster of 3 sun web server 7.0u8 servers named: web1.ex.com, web2.ex.com, web3.ex.com, the following is what I want to achieve:
For #1, the access and server log file names would be configured as the following in the server.xml file:
../logs/access-$localhostname
../logs/errors-$localhostname
Which would result in the following:
/opt/sun/webserver/https-default/logs/access-web2
/opt/sun/webserver/https-default/logs/errors-web2
However, one cannot use a variable when configuring the access and server log file names.
I know I can change the logfile name on rotation by using a csutom command for archive, however I prefer the Web Server start with the local host name in the file name. Also that the currently active log file needs to have the server name in the log file name before archive.
For #2, I need to access a variable with the local host name set as the value, which such variable is available to the custom log configuration.
And I DO NOT want to use the variable expression $(external('/bin/hostname -s','')) which does work - but causes the 'hostname' command to be called on every log line write.
I instead want the local host name to be set in a variable once on startup - so this also means the variable cannot be set in obj.conf which would set the variable on every request.
Also, I cannot hard code the hostname in <variable/> in server.xml, because the Sun Web Server 7.0u8 web administration interface does not support having different configuration information in every nodes' deployment (unless someone shows me how the admin interface supports this).
The resulting custom format for a virtual server might be:
<access-log>
<file>access</file>
<format>$ip "$uri" $path $LOCALHOSTNAME</format>
</access-log>
I know that if I use syslog, I can append the local hostname, but I do not want to rely on syslog. I want the Web Server to append this information. And in this way when logfiles are combined across the web server farm, I know which web server a log line originated from.
? Can #2 be achieved by using an available undocumented variable in the rq->vars pblock ???
How can I do #1 and/or #2. Preferably I would like to do both.

Answer 1

The rq->vars pblock is undocumented to what variables/values are maintained in that pblock.
The Documentation on NSAPI development shows you how to code a NSAPI plugin that can list all the variables in that pblock, stating this can be good for debugging.
Well, I would like to know what is available in that pblock.
See also:
Configuration Guide: set-variable
http://docs.sun.com/app/docs/doc/821-1497/abuis?l=en&a=view&q=pblock
NSAPI Developer's Guide: Request Data Structure
http://docs.sun.com/app/docs/doc/821-1490/abvmz?l=en&a=view
And also this:
NSAPI Developer's Guide: Chapter 2 Creating Custom Server Application Functions
SERVER_NAME char *util_hostname();
Which explains how CGI environment variable can be obtained in NSAPI parameter blocks (the best list of variables in the pblock I could find in the docs) - but unfortunately, every values is obtained from a variable in the NSAPI parameter blocks except for the hostname, which instead is retrieved by executing the util_hostname C function (above).
Is this right?
In any case, how do I get a list of all variables in the pblock?
Is this list documented?
Or has anyone found out this list for themself by executing the NSAPI code to list-pblock variables?
-RG