SDPPE-41: Added configurable php-fpm slowlog timeout setting.

[aparador]

Motivation

The php-fpm request_slowlog_timeout option was not previously configured, by enabling this option

• Slow PHP requests can be logged and traced.
• These traces can be picked up by the php-fpm-exporter, which exposes them as Prometheus metrics.
• This helps developers and platform engineers detect performance issues and identify problematic code paths

Changes

• Added php-fpm.conf under images/php/ with [www] request_slowlog_timeout, slowlog as the contents.
• Updated Dockerfile.fpm to:
  • Copy php-fpm.conf into /usr/local/etc/php-fpm.d/
  • Add ONBUILD ARG and ONBUILD ENV for BAY_PHP_FPM_REQUEST_SLOWLOG_TIMEOUT
• Made the timeout value configurable using an environment variable.
• Maintained default value as 10s unless overridden.

Testing

1. Build image locally cd images/php and docker build -t test-php-fpm -f Dockerfile.fpm .

[nicksantamaria]

I think this is looking good @aparador ! The image for this branch was built, you can see it here - https://github.com/dpc-sdp/bay/pkgs/container/bay%2Fphp-fpm/470096179?tag=pr-367

Should be OK to get the testing steps underway now 👍

[nicksantamaria]

/build

[nicksantamaria]

/build

[nicksantamaria]

/build

[nicksantamaria]

/build

[nicksantamaria]

I have tested this locally by creating a php script with sleep(11); at the top. Hitting this script gives the following results:

The request is added to the slowlog.

[02-Jan-2026 11:16:55] WARNING: [pool www] child 38, script '/app/docroot/index.php' (request: "GET /index.php") executing too slow (10.078954 sec), logging
[02-Jan-2026 11:16:55] NOTICE: child 38 stopped for tracing
[02-Jan-2026 11:16:55] NOTICE: about to trace 38

php-fpm_exporter incremented its slow request metric

phpfpm_slow_requests{pool="www",scrape_uri="tcp://127.0.0.1:9000/status"} 1

I'm happy to merge this one now - thanks for your great work @aparador !