Microsoft.AspNet.TelemetryCorrelation Extensions of Activity class Http header name to carry the Request ID. Http header name to carry the correlation context. Reads Request-Id and Correlation-Context headers and sets ParentId and Baggage on Activity. Instance of activity that has not been started yet. Request headers collection. true if request was parsed successfully, false - otherwise. Reads Request-Id and Correlation-Context headers and sets ParentId and Baggage on Activity. Instance of activity that has not been started yet. Request headers collection. true if request was parsed successfully, false - otherwise. Activity helper class Listener name. Activity name for http request. Event name for the activity start event. Event name for the activity stop event. Key to store the activity in HttpContext. It's possible that a request is executed in both native threads and managed threads, in such case Activity.Current will be lost during native thread and managed thread switch. This method is intended to restore the current activity in order to correlate the child activities with the root activity of the request. Root activity id for the current request. If it returns an activity, it will be silently stopped with the parent activity This should be called after the Activity starts and only for root activity of a request. Context to save context to. Activity to save. Http Module sets ambient state using Activity API from DiagnosticsSource package. ETW EventSource tracing class. Instance of the PlatformEventSource class.