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You're tasked with ensuring the reliability of a high-volume enterprise application. Users report consistent failures in a critical component " a data-intensive reporting feature " resulting in HTTP 500 errors. Upon analysis, you discover a strong correlation between these failures and a metric indicating the size of an internal queue utilized for report generation. Investigation reveals that the failures stem from a reporting backend experiencing heightened I/O wait times. Swift resolution involves adjusting the backend's persistent disk (PD) size. Now, you must establish an availability Service Level Indicator (SLI) for the report generation feature. How would you define it?