Which of the following metrics can measure the effectiveness of a runbook?

Measuring the effectiveness of a runbook is crucial for ensuring that processes are efficient and lead to successful outcomes in incident response and system management. Each of the metrics listed contributes meaningful insights into the effectiveness of a runbook.

Mean time to repair (MTTR) evaluates how quickly issues can be resolved once they are identified. A lower MTTR indicates that the runbook facilitates a swift response to incidents, demonstrating its effectiveness.

Mean time between failures (MTBF) provides an idea of the reliability of a system. A higher MTBF suggests that the system is functioning well over time, implying that the operational procedures outlined in the runbook support stability and prevent frequent issues.

Mean time to discover a security incident measures how long it takes to identify a security incident after it occurs. Effective runbooks can enhance detection processes, leading to shorter times for identifying breaches or vulnerabilities.

Given that all these metrics provide valuable information about different aspects of the operational processes and incident handling, they collectively serve as a comprehensive measure of a runbook's effectiveness. As such, the inclusion of all these metrics in assessing a runbook ensures a well-rounded evaluation, making the answer that encompasses all of them the most appropriate choice.