[2.4.0] Checkmk Werk 16182 created: bi: frozen node becomes CRIT and 'in service period' if the node disappeared

[//]: # (werk v2) # bi: frozen node becomes CRIT and 'in service period' if the node disappeared key | value ---------- | --- date | 2024-04-30T13:01:42+00:00 version | 2.4.0b1 class | fix edition | cre component | bi level | 1 compatible | yes Previously, if the node of a frozen aggregation disappeared, it would become UNKNOWN and `out of service period` instead of being removed from the tree. Now, the node will become CRIT, but remain `in service period` in the same case. The state was changed to alarm the user about the change in the aggregation tree better. `out of service period` was removed because it does not apply to the entities that no longer exist.