Azure by Patrik

Filtering by EventId in Application Insights — With a Twist

When you use EventId in .NET logs, both the Id (an integer) and Name are sent to Application Insights as part of customDimensions. However, the EventId.Id is stored as a string, which affects how you can filter it.

Limitation in UI Filters

The Application Insights UI filter panel only supports string operations like equals or contains. You can’t use greater than or less than filters directly in the UI.

Use KQL for Numeric Filtering

To filter numerically, use the Logs (Analytics) tab with Kusto Query Language (KQL):

traces
| extend EventIdInt = toint(customDimensions["EventId.Id"])
| where EventIdInt > 1000

This converts the string to an integer so you can filter properly.

Pro Tip

Use numeric ranges for EventId to categorize logs (e.g., 1000–1999 = Auth, 2000–2999 = Payments) and filter easily with KQL.

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