public async Task Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log, ExecutionContext executionContext)
{
// The azure function runtime creates request telemetry for each invocation. When an EventGridTrigger is used this telemetry
// cannot be accessed. Instead, we can add additional data to the custom properties of the RequestTelemetry by adding tags to the current activity
Activity.Current
.AddTag("EventId", eventGridEvent.Id)
.AddTag("EventDateTime", eventGridEvent.EventTime.ToString(CultureInfo.InvariantCulture));
// If we want to add (the same) data to telemetry in the same operation we can add baggage to the current activity
Activity.Current
.AddBaggage("EventId", eventGridEvent.Id)
.AddBaggage("EventType", eventGridEvent.EventType);
log.LogInformation("Received event. Data: {Data}", eventGridEvent.Data);
var eventData = eventGridEvent.As <EventData>();
using (var operation = _telemetryClient.StartOperation <DependencyTelemetry>($"{executionContext.FunctionName}", eventData.OperationId, eventData.ParentOperationId))
{
operation.Telemetry.Success = false;
operation.Telemetry.Type = "EventHandler";
operation.Telemetry.Properties["EventId"] = eventGridEvent.Id;
// Any outgoing calls during this invocation are tracked as dependencies belonging to this operation
await new HttpClient().GetStringAsync("http://blank.org/");
log.LogInformation("Handled event");
operation.Telemetry.Success = true;
}
}