During a quarterly review, the site reliability team presents three values for a customer-facing API: measured availability for the last quarter is 99.93 %; the internal target is 99.9 % monthly availability; and the customer contract promises 99.5 % monthly availability with service-credit penalties. According to Linux monitoring terminology, what is the 99.9 % value called?
The 99.9 % figure is a service-level objective. An SLO is an internal numeric reliability goal (for example, "at least 99.9 % availability each month") that the team uses to judge whether the service is healthy. The 99.93 % value is a service-level indicator because it represents the measured performance of the service. The 99.5 % contractual commitment is the service-level agreement, which includes penalties if it is not met. An alert threshold is merely a trigger point for notifications and does not represent a formal reliability commitment, so it is not correct here.
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