Thundra Lambda extension is a kind of companion process which provides asynchronous telemetry data (traces, metrics, logs) reporting functionality to the Thundra agents. To do that, Thundra extension starts a local collector and Thundra agent sends collected data to the local collector endpoint without any network delay. Then Thundra extension sends buffered data to the real collector asynchronously along with the execution of the invocation. So there will be zero network delay added by Thundra agent. Additionally, remaining buffered telemetry data is flushed on shutdown of the Lambda container.