Checkmk Werk 14342: agent_prometheus & prometheus_build_info: change to display version of main instance

ID: 14342 Title: agent_prometheus & prometheus_build_info: change to display version of main instance Component: Checks & agents Level: 1 Class: Bug fix Version: 2.2.0i1 Previously, the agent returned an error if the build_info PromQL returned multiple entries. This effectively prevented the user from using the agent for a Prometheus cluster setup. This werk removes this limitation and adjusts the Prometheus Build Service accordingly. The customization is only visible for Prometheus instances running below version 2.14 and the details can be found in the updated man page