Werk #17693: Limit length of Hostname to 240 chars

Component	Setup
Title	Limit length of Hostname to 240 chars
Date	Mar 4, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p29 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Werk #16219 already limited the maximal Hostname length to 253.

As Checkmk uses the Hostname for various internal files, some suffixes and prefixes to that files lead to problems, especially on deleting such host.

With the new limit of 240 chars you still can delete a host.

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