Public Preview: Dynamic threshold for Log search alerts

We’re bringing Azure Monitor’s dynamic threshold capabilities to Log search alerts!Using dynamic thresholds means you don't have to know the right threshold for each Log alert rule - Dynamic thresholds calculate the most appropriate thresholds for you. **Key benefits**Dynamic thresholds apply advanced machine learning and use a set of algorithms and methods to: 1. Learn the historical behavior of log query results. 2. Analyze these results over time and identify hourly / daily / weekly seasonal patterns. 3. Calculate the most appropriate thresholds for log alert rules. 4. Adapt automatically to changes in data patterns and adjust the threshold accordingly. 5. At-scale monitoring - in rule monitoring multiple dimensions - the Dynamic threshold is calculated individually, per dimension combination. [Learn more](https://aka.ms/lsa-dt-publicpreview-blog).