def __init__(self, name: str, environment: str, zone: str, timestamp: str=None):
    super().__init__()
    self['name'] = name
    self['environment'] = environment
    self['zone'] = zone
    if timestamp:
        self['timestamp'] = timestamp
    else:
        self['timestamp'] = datetime.datetime.now().isoformat()
def __init__(self, name: str, environment: str, zone: str, timestamp: str=None):
    super().__init__()
    self['name'] = name
    self['environment'] = environment
    self['zone'] = zone
    if timestamp:
        self['timestamp'] = timestamp
    else:
        self['timestamp'] = datetime.datetime.now().isoformat()