pierrejeambrun commented on code in PR #44074:
URL: https://github.com/apache/airflow/pull/44074#discussion_r1846352112


##########
airflow/ui/src/pages/DagsList/Dag/Overview/Overview.tsx:
##########
@@ -0,0 +1,96 @@
+/*!
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { Box, HStack, Badge, Text, Skeleton } from "@chakra-ui/react";
+import dayjs from "dayjs";
+import { useState } from "react";
+import { Link, useLocation, useParams } from "react-router-dom";
+
+import { useTaskInstanceServiceGetTaskInstances } from "openapi/queries";
+import TimeRangeSelector from "src/components/TimeRangeSelector";
+import { pluralize } from "src/utils";
+import { stateColor } from "src/utils/stateColor";
+
+import { Chart } from "./Chart";
+
+const defaultHour = "8";
+
+export const Overview = () => {
+  const { dagId } = useParams();
+
+  const now = dayjs();
+  const [startDate, setStartDate] = useState(
+    now.subtract(Number(defaultHour), "hour").toISOString(),
+  );
+  const [endDate, setEndDate] = useState(now.toISOString());
+
+  const { data: failedTasks, isLoading } =
+    useTaskInstanceServiceGetTaskInstances({
+      dagId: dagId ?? "",
+      dagRunId: "~",
+      logicalDateGte: startDate,
+      logicalDateLte: endDate,
+      state: ["failed"],
+    });
+
+  const location = useLocation();
+
+  // TODO actually link to task instances list
+  return (
+    <Box m={4}>
+      <Box my={2}>
+        <TimeRangeSelector
+          defaultValue={defaultHour}
+          endDate={endDate}
+          setEndDate={setEndDate}
+          setStartDate={setStartDate}
+          startDate={startDate}
+        />
+      </Box>
+      {failedTasks?.total_entries !== undefined &&
+      failedTasks.total_entries > 0 ? (

Review Comment:
   I think we should still display the graph with a flat `0` line if there are 
no failed task. In its current state the graph is just not displayed with can 
be a little surprising.



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