What KPIs Should I Be Measuring for Cybersecurity?

The six most important Key Performance Indicators (KPIs) to measure for cybersecurity are:

1.     MTTD: Mean Time to Detect – how fast do you identify an attack?
2.     MTTA: Mean Time to Acknowledge – how quickly can the security team verify an attack?
3.     MTTR: Mean Time to Respond – how long does it take to start mitigation against the attack?
4.     MTTC: Mean Time to Contain – how long does it take to isolate the threat and prevent further impact?
5.     MTTR(2): Mean Time to Recovery – how long does it take for the company to recover from the threat or any downtime/issues caused by it?
6.     MTBF: Mean Time Between Failures – what is the average time between system failures?