Werk #14678: mk_docker is docker >=6.0.0 compatible

Component	Agent bakery
Title	mk_docker is docker >=6.0.0 compatible
Date	Aug 30, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p29 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The mk_docker plugin now works with docker version 6 or later.

Previously, the plugin would fail with a message that the module docker.version was not json serializable.

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