CompTIA Linux+ XK0-006 (V8) Practice Question

The correct answer is a threshold. In system monitoring, a threshold is a predefined limit for a metric that, when crossed, triggers a specific action like an alert or notification. In this scenario, the 15% available disk space is the configured boundary that triggers the email notification.

• A Service-Level Objective (SLO) is a broader, internal target for the performance of a service over time, such as 99.9% uptime, not a single metric trigger point.
• A health check is a method to determine if a service is operational, for example, by querying an application endpoint to see if it is responsive.
• Log aggregation is the process of collecting logs from various systems into a centralized location for analysis and is not a specific alert value.