[2.2.0] Checkmk Werk 16176 created: postfix: Fix Postfix status monitoring for agents run in Docker

Title: postfix: Fix Postfix status monitoring for agents run in Docker Class: fix Compatible: compat Component: checks Date: 1710323821 Edition: cre Level: 1 Version: 2.2.0p24 Previously, Checkmk agent used the data from /proc to determine if Postfix instance is running. Since docker containers don't have permissions to read /proc, the agent always reported the Postfix instance as 'not running'. This resulted in CRIT 'Postfix status' service even if Postfix instance was running correctly.