Which three types of visuals in Power BI support alert functionality when data reaches certain thresholds?

In Power BI, the visuals that support alert functionality typically include those that represent single values or performance indicators. Alerts in Power BI allow users to be notified when a data point exceeds a specific threshold, which is particularly useful for monitoring key metrics.

The Card visual is specifically designed to display a single important value, such as total sales or the number of active users. Because it's focused on one key metric, it is effective for setting alerts that notify users when that value crosses a predefined limit.

Both the Gauge and KPI visuals are also designed for tracking a single metric against a target. Gauge visuals show progress towards a goal, while KPIs provide a quick overview of key performance metrics with a target comparison. These visualizations can effectively support alert functionality, as they are integral to performance tracking.

In contrast, a Treemap is used to display hierarchical data as a set of nested rectangles. While it effectively visualizes proportions and relationships between segments of data, it does not support alert functionality because it's not designed to convey a single threshold value in a format that can trigger alerts.

Therefore, the Card, Gauge, and KPI visuals are effective options for setting up alerts based on data thresholds within Power BI, facilitating proactive monitoring of important metrics.