class="card">
            <div class="card-header">
                <h3 class="card-title">内存统计</h3>
            </div>
            <div class="card-body table-responsive">
                <table class="table table-bordered">
                    <thead>
                    <tr>
                        <th scope="col">机房</th>
                        <th scope="col">机器内存(分配内存/总内存)</th>
                        <th scope="col">实例内存(使用内存/分配内存)</th>
      