private final AtomicLong totalCircuitOpenRejections = new AtomicLong(0);
    private final AtomicLong totalTimeInOpen = new AtomicLong(0);
    private final AtomicLong openStateStartTime = new AtomicLong(0);

    // Event listeners
    private final List<CircuitBreakerListener> listeners = new CopyOnWriteArrayList<>();

    // Configuration
    private volatile int failureThreshold;
    private final int successThreshold;

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     *
     * Current strategy is based on failure count. In the future, this could be enhanced to consider:
     * - Recent event frequency (successful notifications)
     * - Time since last successful notification
     * - Events per unit time for more adaptive behavior
     *
     * @param handle notification handle
     * @return polling interval in milliseconds
     */