Improve log message around interpreter attach/cleanup/destroy

[michael-o]

Improve log by saying whether a main interpreter is created or a named one (subinterpreter).

Output:

httpd-error.log:2026-02-15 01:15:17.587531 [pid: 47513, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47513): Attach main interpreter.
httpd-error.log:2026-02-15 01:15:17.587837 [pid: 47514, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47514): Attach main interpreter.
httpd-error.log:2026-02-15 01:15:17.587984 [pid: 47515, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47515): Attach main interpreter.
httpd-error.log:2026-02-15 01:15:18.594050 [pid: 47519, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47519): Attach main interpreter.
httpd-error.log:2026-02-15 01:16:20.537041 [pid: 47519, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47519): Cleanup main interpreter.
httpd-error.log:2026-02-15 01:16:20.537069 [pid: 47513, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47513): Cleanup main interpreter.
httpd-error.log:2026-02-15 01:16:20.537110 [pid: 47514, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47514): Cleanup main interpreter.
httpd-error.log:2026-02-15 01:16:20.537823 [pid: 47515, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47515): Cleanup main interpreter.
httpd-error.log:2026-02-15 01:16:21.570549 [pid: 47781, tid: 35056574464] [wsgi:info] mod_wsgi (pid=47781): Attach main interpreter.
httpd-error.log:2026-02-15 01:16:21.570815 [pid: 47782, tid: 35056574464] [wsgi:info] mod_wsgi (pid=47782): Attach main interpreter.
httpd-error.log:2026-02-15 01:16:21.570829 [pid: 47783, tid: 35056574464] [wsgi:info] mod_wsgi (pid=47783): Attach main interpreter.
httpd-error.log:2026-02-15 01:16:22.635472 [pid: 47785, tid: 35056574464] [wsgi:info] mod_wsgi (pid=47785): Attach main interpreter.
kona-dev.innomotics.net-error.log:2026-02-15 01:15:17.587854 [pid: 47512, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47512): Attach main interpreter.
kona-dev.innomotics.net-error.log:2026-02-15 01:16:21.038598 [pid: 47512, tid: 35046014976] [wsgi:info] mod_wsgi (pid=47512): Cleanup main interpreter.
kona-dev.innomotics.net-error.log:2026-02-15 01:16:21.571154 [pid: 47780, tid: 35056574464] [wsgi:info] mod_wsgi (pid=47780): Attach main interpreter.

I intentionally haven't used the term subinterpreter because it would have been inconsistent with the rest of the log message. It needs to be done consistently throughout.

This fixes #942.

[michael-o]

I am not 100% whether destroy is also subject to main/sub handling.

[GrahamDumpleton]

The distinction that it is a sub interpreter is actually meaningful as many people using Python don't even realise there are sub interpreters. I will need to check logging elsewhere bit maybe then should be:

Initialize main interpreter.
Destroy main interpreter.

and:

Attach sub interpreter 'name'.
Cleanup sub interpreter 'name'.

Sub interpreters hang off the main interpreter so language just needs to be different.

[michael-o]

The distinction that it is a sub interpreter is actually meaningful as many people using Python don't even realise there are sub interpreters. I will need to check logging elsewhere bit maybe then should be:

Initialize main interpreter.
Destroy main interpreter.

and:

Attach sub interpreter 'name'.
Cleanup sub interpreter 'name'.

Sub interpreters hang off the main interpreter so language just needs to be different.

Yes, please do. My point is that there a too many places logging about subinterpreters (named ones), ideally this would be consistently. I cannot tell for certain which other statements need to aligned as well.