def get_health_check_last_failure_reason(HealthCheckId=None):
    """
    Gets the reason that a specified health check failed most recently.
    See also: AWS API Documentation
    
    
    :example: response = client.get_health_check_last_failure_reason(
        HealthCheckId='string'
    )
    
    
    :type HealthCheckId: string
    :param HealthCheckId: [REQUIRED]
            The ID for the health check for which you want the last failure reason. When you created the health check, CreateHealthCheck returned the ID in the response, in the HealthCheckId element.
            

    :rtype: dict
    :return: {
        'HealthCheckObservations': [
            {
                'Region': 'us-east-1'|'us-west-1'|'us-west-2'|'eu-west-1'|'ap-southeast-1'|'ap-southeast-2'|'ap-northeast-1'|'sa-east-1',
                'IPAddress': 'string',
                'StatusReport': {
                    'Status': 'string',
                    'CheckedTime': datetime(2015, 1, 1)
                }
            },
        ]
    }
    
    
    """
    pass
