}

        public double getHealthCheckSuccessRate() {
            return totalHealthChecks > 0 ? 1.0 - ((double) failedHealthChecks / totalHealthChecks) : 1.0;
        }

        public double getPoolUtilization() {
            return maxPoolSize > 0 ? (double) activeConnections / maxPoolSize : 0.0;
        }

        @Override
        public String toString() {
            return String.format(