fix: 修复Expression metric-input不正确

nezha-fronted/src/components/common/rightBox/alertRuleBox.vue

@@ -26,7 +26,7 @@
                 :index="0"
                 :plugins="['metric-selector','metric-input']"
                 :required="true"
-                :styleType="2"
+                :styleType="3"
                 @change="metricChange"
               ></promql-input>
             </el-row>

nezha-fronted/src/components/page/dashboard/explore/promqlInput.vue

@@ -39,7 +39,7 @@
         </div>
       </template>
       <!--right-box里的样式-->
-      <template v-if="styleType == 2">
+      <template v-if="styleType === 2 || styleType === 3">
           <el-row v-if="plugins.indexOf('metric-input') > -1 || plugins.indexOf('metric-selector') > -1"
                   style="width: 100%;">
             <el-col
@@ -68,7 +68,7 @@
               :style="{'width':plugins.indexOf('metric-selector') > -1 ? 'calc(100% - 160px)':'100%',height: '100%',}">
               <div class="input-box" @click="dropDownVisible=false" v-if="plugins.indexOf('metric-input') > -1">
                 <!--<editor :styleType="styleType" :metric-list="metricStore" :historyParam="historyParam" v-model="expressionList[index]" ref="editor" @on-enter="expressionChange" @on-blur="expressionChange" ></editor>-->
-                <el-input maxlength="4096" show-word-limit v-model="expressionList[index]" @input="metricKeyDown"   type="textarea"
+                <el-input v-model="expressionList[index]" @input="metricKeyDown"   type="textarea" :maxlength="styleType === 3 ? 512 : 4096" show-word-limit
                           :autosize="{ minRows: 1, maxRows: 6}" class="not-fixed-height no-resize" ref="elInput"></el-input>
                 <div class="append-msg error" v-if="errorMsg"><span>{{errorMsg}}</span></div>
                 <div class="append-msg error" v-if="appendMsg"><span>{{appendMsg}}</span></div>