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The problem
Force-creating activities via
new Activity(...)breaks fundamental Activity logic. You are replacingActivity.Current, but the other code does not expect this, because nobody listens to your activity source and nobody expectsActivity.Currentto suddenly change.For example, if I roll a custom
SubchannelPickerimplementation and start creating activities there, these activities will be broken when exported to tracing collector. This happens because you have forcibly replacedActivity.Current, so my custom activity will have your activity as a parent. But nobody listens to your activity source, so your Activity is not exported, which means my custom activity will have an unknown parent activity id.The solution
Do not create an activity if nobody listens to your activity source