This fix affects users who use Kubernetes host labels.
Previously, labels which are set by Kubernetes would be mapped one-to-one to Checkmk labels. This
would mean that setting labels in Kubernetes could overwrite Checkmk labels, which should not be
overwritten. For instance, setting the label cmk/os_family=something would incorrectly set the
corresponding Checkmk label to cmk/os_family:something. With this werk, Checkmk labels are
prefixed with cmk/kubernetes/label/. For example, Checkmk now sets the aforementioned label to
User-defined rules with old host labels need to be updated.
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