Which example illustrates a warning event?

A warning event is characterized by conditions that indicate the potential for future issues if not addressed, but they do not yet signify a failure. In this context, a transaction completion time that is 10% higher than normal serves as an alert that there might be an underlying performance issue developing. It suggests that while the service is still operational, there may be a need for investigation to prevent any escalation into more significant performance degradation or service disruption.

The other examples provided illustrate different scenarios:

• CPU utilization above acceptable levels indicates that the system is under stress, which could escalate to a failure.

• Unauthorized access attempts suggest a security threat that could lead to incidents but aren't indicative of current operational performance issues.

• Failed software installations represent outright failures that need immediate attention.

The chosen example emphasizes early detection of potential issues, making it a prime example of a warning event as defined within the Event Management process in ITIL.