Werk #19389: Support Diagnostics: Add output of 'ip a'

Component	Setup
Title	Support Diagnostics: Add output of 'ip a'
Date	Feb 20, 2026
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The Support Diagnostics dump now contains the output of the command 'ip a'.

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