An SLA is a set of thresholds that applies to a single statistic (average response time, hit rate, and so on). An SLA belongs to a family of service levels:
Per Run: These runtime-based SLAs are evaluated at the end of the test on:
the global test statistics; and
the global statistics for each element linked to a profile.
Per Time Interval: These interval-based SLAs are evaluated each time a result is received during test runtime. When a threshold in this family of SLAs is breached, an alert is triggered in real time. For more information about real-time alerts, see Runtime alerts.