Werk #17930: Add check plugin for HAProxy backends

Component	Checks & agents
Title	Add check plugin for HAProxy backends
Date	Jun 12, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p9 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

For HAProxies, the agent output for HAProxy backends already exists, but there is no check plugin that provides this output as a service.

This check plugin has now been added.

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