Werk #15560: Drop support for Debian-9

Component Site management
Title Drop support for Debian-9
Date May 2, 2023
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.2.0b6
Level Trivial Change
Class Bug Fix
Compatibility Incompatible - Manual interaction might be required

Checkmk won't be built anymore for Debian-9 (stretch) from 2.2.0 and upwards as Debian-9's LTS support ended on June 30, 2022: https://wiki.debian.org/LTS

The support from our side was already dropped during the beta phase with 2.2.0b5.

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