filters out dependencies like polling queues that are not attached to any larger operation.

AzureDependencyFilterTelemetryProcessor

/// filters out dependencies like polling queues that are not attached to any larger operation.
public class AzureDependencyFilterTelemetryProcessor : ITelemetryProcessor
{
    private readonly ITelemetryProcessor _inner;

    public AzureDependencyFilterTelemetryProcessor(ITelemetryProcessor inner)
    {
        _inner = inner;
    }

    public void Process(ITelemetry item)
    {
        if (item is Microsoft.ApplicationInsights.DataContracts.DependencyTelemetry dependency
            && dependency.Success == true
            && dependency.Context.Operation.Name == null
            && (dependency.Type == "Azure Service Bus"
                || dependency.Type == "Azure table"
                || dependency.Type == "Azure blob"
                || dependency.Type == "Azure queue"))
        {
            return;
        }

        _inner.Process(item);
    }
}

// in Startup.cs:
services.AddApplicationInsightsTelemetryProcessor<AzureDependencyFilterTelemetryProcessor>();
// link https://app.pluralsight.com/guides/configure-dependency-collection-in-apps-using-insights-sdk-for-.net-in-azure
// and https://docs.microsoft.com/en-us/azure/azure-monitor/app/api-filtering-sampling

// some AI queries:
dependencies | project ['type'] | summarize count() by ['type']

dependencies
| where ['type'] contains "HTTP"