Explanation:

To create a custom workbook in Microsoft Sentinel that displays the number of security alerts per day for each provider , you need to use Kusto Query Language (KQL) functions designed for data aggregation and visualization .
* Using bin(TimeGenerated, 1d)
* The bin() function in KQL is used to group data into time intervals (bins).
* In this case, you want to aggregate alerts by day , so the correct syntax is:
* bin(TimeGenerated, 1d)
* This ensures that the query counts all alerts that fall within each 1-day time window.
* The summarize operator then counts the number of alerts for each ProviderName per day.
* Example:
* summarize count() by ProviderName, bin(TimeGenerated, 1d)
* Using render timechart
* After summarizing data, you use the render operator to specify how the results should be visualized in the Sentinel workbook.
* The timechart rendering type creates a line chart or bar chart where the x-axis represents time (here, days) and the y-axis represents alert counts .
* This visualization helps security analysts quickly see trends and patterns of alert volume per provider over time.
* Example:
* render timechart
* Complete Query Example:
* SecurityAlert
* | where TimeGenerated > = ago(30d)
* | summarize count() by ProviderName, bin(TimeGenerated, 1d)
* | render timechart
This query counts the number of security alerts for each provider (such as Microsoft Defender for Endpoint, Defender for Cloud, etc.) over the last 30 days , grouping results by day and plotting them visually in a time chart .
# Final Answer:
* Aggregation: bin(TimeGenerated, 1d)
* Visualization: render timechart