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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def _on_trace_notification(self, trace_event):
 """Callback function called when a trace chunk is received. Args: trace_chunk (dict):
 The received trace chunk information """


        conn_string = trace_event.get('connection_string')
        payload = trace_event.get('payload')

        await self.notify_event(conn_string, 'trace', payload)