Mean Time to Remediate (MTTR) measures the average time from the detection of a security incident to its complete resolution. In the given scenario, this is the time from the initial alert (detection) at 09:15 to when the system was fully restored (remediation) at 14:45. Mean Time to Detect (MTTD) would measure the time before the alert was generated. Mean Time to Respond (MTTR) typically refers to the time from alert to the start of the investigation (15 minutes in this case). Alert volume is a count of alerts, not a time-based metric.
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