What threshold will trigger an alert for memory saturation on Linux systems?

The threshold that triggers an alert for memory saturation on Linux systems is determined by specific metrics related to memory usage and page fault rates. In this case, the correct choice is related to a combination of both memory usage and page fault metrics that indicate the performance and health of the system.

When memory usage exceeds 80% and the page fault rate is higher than 20 faults per second, it suggests that the system is experiencing significant memory pressure. High memory usage indicates that the system is approaching its capacity limit, while a high page fault rate suggests that the operating system is struggling to manage memory effectively, leading to slower performance and potentially causing applications to become unresponsive.

By setting an alert at these levels, it allows system administrators to take proactive measures before the system becomes critically overloaded, ensuring better performance and stability. This combination of metrics is a recognized indicator in managing memory saturation, as both elements must be considered together to accurately assess the risk of memory saturation effectively.