def __init__()

in lambda_function_code/metric.py [0:0]


    def __init__(self, metric_name, project_name, metadata, environment):
        """Class constructor. child classes should not need to implement this.

        Args:
            metric_name (str): the name of this metric
            project_name (str): the project the metric belongs to
            metadata (dict): the metadata
        """
        self.metric_name = metric_name
        self.project_name = project_name
        self.metadata = metadata
        self.environment = environment