code: def _get_span_name(servicer_context):
      
      method_name = servicer_context._rpc_event.call_details.method[1:]
      if isinstance(method_name, bytes):
          method_name = method_name.decode('utf-8')
      method_name = method_name.replace('/', '.')
      return '{}.{}'.format(RECV_PREFIX, method_name)
docs: Generates a span name based off of the gRPC server rpc_request_info