What is a change of state that has significance for the management of a configuration item (CI) called?

An event is the ITIL term for a change of state that is significant for managing a CI or IT service, and it is the core input into the event management process. Events are detected by monitoring tools and can trigger incidents, problems, or changes depending on their type and severity. This definition is explicitly stated in the ITIL glossary and directly matches the question.

A baseline is a snapshot of a CI's configuration at a specific point in time used as a reference for future comparison, not a description of a change of state.

A change to a service level agreement refers specifically to a modification of a formal contractual agreement between a provider and customer, not a general CI state transition.

A request for change (RFC) is a formal proposal submitted to change management requesting that a change be made, not a record of a CI's actual change of state.