Update CloudWatch metrics configuration.

def update_stage_config(    self,
                                project_name,
                                stage_name,
                                cloudwatch_log_level,
                                cloudwatch_data_trace,
                                cloudwatch_metrics_enabled
                            ):
        """
        Update CloudWatch metrics configuration.
        """
        if cloudwatch_log_level not in self.cloudwatch_log_levels:
            cloudwatch_log_level = 'OFF'

        for api in self.get_rest_apis(project_name):
            self.apigateway_client.update_stage(
                restApiId=api['id'],
                stageName=stage_name,
                patchOperations=[
                    self.get_patch_op('logging/loglevel', cloudwatch_log_level),
                    self.get_patch_op('logging/dataTrace', cloudwatch_data_trace),
                    self.get_patch_op('metrics/enabled', cloudwatch_metrics_enabled),
                ]
            )