<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_instrumentation_callback(self, callback):
 """Assign a method to invoke when a request has completed gathering measurements. :param method callback: The method to invoke """

        self.logger.debug('Setting instrumentation callback: %r', callback)
        self._instrumentation_callback = callback