def assess_fault_probability(self, node, metrics):
    """
    Assess the fault probability of a node based on performance metrics.
    
    Args:
        node (str): The node to assess.
        metrics (dict): Performance metrics for the node including response time, error rate, and resource utilization.

    Returns:
        float: The fault probability of the node.
    """
    # Define thresholds for performance metrics
    response_time_threshold = 300  # milliseconds
    error_rate_threshold = 0.05  # 5% errors
    resource_utilization_threshold = 0.80  # 80% utilization

    # Define weights for each metric's contribution to fault probability
    response_time_weight = 0.4
    error_rate_weight = 0.4
    resource_utilization_weight = 0.2

    # Initialize fault probability score
    fault_probability_score = 0.0

    # 检查可达性
    # Check if the node is reachable
    if 'is_reachable' in metrics and not metrics['is_reachable']:
        return 0.9

    # Calculate contributions of each metric to the fault probability score
    if 'response_time' in metrics:
        if metrics['response_time'] > response_time_threshold:
            fault_probability_score += (metrics['response_time'] / response_time_threshold) * response_time_weight

    if 'error_rate' in metrics:
        if metrics['error_rate'] > error_rate_threshold:
            fault_probability_score += (metrics['error_rate'] / error_rate_threshold) * error_rate_weight

    if 'resource_utilization' in metrics:
        if metrics['resource_utilization'] > resource_utilization_threshold:
            fault_probability_score += (metrics['resource_utilization'] / resource_utilization_threshold) * resource_utilization_weight

    # Normalize the fault probability score to be between 0 and 1
    fault_probability_score = min(fault_probability_score, 1.0)

    # 相关性检测
    # Calculate the correlation between the performance metrics and the fault probability score
    correlation = 0.0
    if 'correlation' in metrics:
        correlation = metrics['correlation']
        fault_probability_score += correlation

    return fault_probability_score

