Werk #15646: KUBE: Extend 'Node conditions' Rule

Previously, Checkmk identified any NodeCondition with status True, except for the Ready condition, as a problem state. However, some Kubernetes addons report custom NodeConditions. In some cases, the True status of these conditions is desired. With this Werk, this is fully configurable.

Since there are no longer pre-defined problem states, the NodeConditions are now shown in the summary based on their monitoring states.

The affected rule Node conditions has been renamed to Kubernetes node conditions.

The default rules ensure that the monitoring states of existing services do not change. Existing rules are migrated. Manual intervention is only needed if there are multiple Kubernetes node conditions rules, which apply the to the same service. Previously, each NodeCondition would use the rule with a matching parameter. The new rule contains only a single parameter, thus only the first rule applies.

Moreover, some minor tweaks have been done.

• The check falsely reported .status.message to be None. The proper message is now shown.
• NodeConditions are now shown in the order they are received from the Kubernetes API.
• The check no longer shows NodeConditionStatus.FALSE, instead it now shows False.
• The check is unaffected if one of the following conditions is missing: Ready, MemoryPressure, PIDPressure, DiskPressure. This should not affect the monitoring since the Kubernetes API server ensures that these conditions are always present.

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