B. Service-level indicator (SLI)
In Google's Site Reliability Engineering (SRE) framework, a Service-level indicator (SLI) is a metric used to measure how well a system is performing. SLIs are quantitative measures that track the reliability and performance of a service. Common examples of SLIs include request latency, error rate, and system uptime.
Here's a breakdown of the other options:
A. Service-level agreement (SLA): This is a formal agreement between a service provider and a customer that specifies the expected level of service, often including penalties if the service level is not met. It's a contractual measure, not directly a performance metric.
C. Error reporting: This refers to the process of capturing and reporting errors within the system, but it is not a measure of overall system performance.
D. Service-level objective (SLO): This is a target or goal for a service's performance, typically expressed in terms of an SLI. For example, an SLO might be to maintain 99.9% uptime, which corresponds to a target for an SLI like system availability.
Thus, SLI is the concept that directly measures system performance
B: Service-Level Indicator (SLI): An SLI is a carefully defined quantitative measure of some aspect of the level of service that is provided. Most often, an SLI is a metric or combination of metrics that directly reflect the performance, reliability, and overall health of a system. Common examples include uptime, response time, latency, error rates, and throughput. SLIs are used to objectively measure how effectively a service is meeting desired performance standards.
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