Steps to reproduce:

1. Use the PHP-FPM by Zabbix agent template
2. PHP-FPM: Number of processes running returns no processes

[bug report] PHP-FPM: Process is not running - ZABBIX Forums

Result:
Returns 0 when PHP-FPM processes are running
Expected:
Returns number of PHP-FPM processes running

Fix:

update PHP-FPM templates as follows

1. Add a new macro to the template

the user is typically www-data but do ps -ef|grep php-fpm to confirm

Macro: {$PHP_FPM.USER}
Value: www-data

2. Update existing Item "PHP-FPM: Number of processes running" key
from
Code:
proc.num["\{$PHP_FPM.PROCESS_NAME}"]
to:
Code:
proc.num[,"\{$PHP_FPM.USER}",,"\{$PHP_FPM.PROCESS_NAME}"]

I have uploaded the edited template from zabbix 6.0.7 that will hopfully help.