Test coverage for isMonitorOnlyAlert, quietHoursCategoryForAlert, and
ensureValidHysteresis functions that were previously untested. Improves
internal/alerts coverage from 46.4% to 46.8%.
Test coverage for pure utility functions:
- sanitizeAlertKey: string normalization for alert IDs
- abs: absolute value for float64
- isQueueOutlier: queue anomaly detection logic
- scaleThreshold: threshold scaling with ceiling
- calculateMedianInt: integer median calculation
78 test cases added, coverage improved from 45.3% to 46.2%.
