Summary
High-level snapshot of critical security metrics for quick threat assessment and executive reporting.

- Total Alerts: Total number of rows in the alert's schema in the selected time range.
- Critical/High-Severity Alerts: Total number of alerts where severity = Critical/High in the selected time range.
- Top Risk Channel: Aggregation of alerts by channel in the selected time range and returning the top channel.
- Top Risk Department: Aggregation of alerts by department in the selected time range and returning the top department.
- Average Time to Close: Average of time-to-resolve in the selected time range.