How is service-level availability SLO calculated?

The calculation of service-level availability, or Service Level Objective (SLO), is predominantly assessed by evaluating the performance of service calls. Specifically, it is determined by dividing the number of successful service calls by the total number of service calls made within a specified period. This metric provides a clear indication of how consistently the service meets predefined goals for availability.

By calculating the ratio of successful calls, organizations can measure their systems' reliability and performance, ensuring they meet user expectations and service agreements. This SLO is crucial for maintaining trust with users and aligning technical performance with business objectives.

The other options do not provide a viable method for calculating service-level availability. Simply adding the total number of service calls does not reflect performance or reliability. Counting users or analyzing user satisfaction ratings, while useful in assessing overall user experience, does not directly measure the operational performance metrics essential for SLO calculations.