@staticmethod
def _datetime_to_label_safe_datestring(datetime_obj):
    """
        Kubernetes doesn't like ":" in labels, since ISO datetime format uses ":" but
        not "_" let's
        replace ":" with "_"

        :param datetime_obj: datetime.datetime object
        :return: ISO-like string representing the datetime
        """
    return datetime_obj.isoformat().replace(':', '_').replace('+', '_plus_')
