Which aspect does the Reliability pillar of the Well-Architected Framework primarily address?

The Reliability pillar of the AWS Well-Architected Framework primarily focuses on the ability of a system to recover from failures and continue to function as expected. This includes ensuring that the application is designed to handle various types of failures, whether they are hardware malfunctions, network interruptions, or other unexpected issues. Key concepts within this pillar encompass the implementation of automated recovery processes, redundancy, and regular testing of failure scenarios to improve resilience.

A system built with reliability in mind will incorporate mechanisms for monitoring, alerting, and automatically responding to any disruptions or outages, thereby minimizing downtime. This proactive approach helps maintain service availability and user satisfaction, making sure that even when failures occur, they are quickly addressed, and the system can resume normal operations efficiently.

The other aspects mentioned in the options relate to different pillars of the Well-Architected Framework, such as performance optimization and security, which are not the primary focus of the Reliability pillar.