jscheffl commented on code in PR #39899:
URL: https://github.com/apache/airflow/pull/39899#discussion_r1617835374


##########
airflow/api_connexion/openapi/v1.yaml:
##########
@@ -4124,6 +4124,14 @@ components:
           readOnly: true
           items:
             type: string
+        doc_md:
+          type: string
+          readOnly: true
+          nullable: true
+          description: |
+            Task documentation.

Review Comment:
   ```suggestion
               Task documentation in markdown.
   ```



##########
airflow/www/static/js/dag/details/taskInstance/TaskDocumentation.tsx:
##########
@@ -0,0 +1,83 @@
+/*!
+ * 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 React from "react";
+import {
+  Accordion,
+  AccordionItem,
+  AccordionButton,
+  AccordionPanel,
+  AccordionIcon,
+  Alert,
+  AlertIcon,
+  Box,
+  Spinner,
+  Text,
+} from "@chakra-ui/react";
+
+import { useTaskDetail } from "src/api";
+import ReactMarkdown from "src/components/ReactMarkdown";
+
+interface Props {
+  taskId: string;
+}
+
+const TaskDocumentation = ({ taskId }: Props) => {
+  const { data, isLoading, error } = useTaskDetail({
+    taskId,
+  });
+
+  if (isLoading) {
+    return <Spinner size="md" thickness="4px" speed="0.65s" />;
+  }
+
+  if (error) {
+    return (
+      <Alert status="error" marginBottom="10px">
+        <AlertIcon />
+        An error occurred while fetching task documentation.
+      </Alert>
+    );
+  }
+
+  if (data && data.docMd) {
+    return (
+      <Box mt={3} flexGrow={1}>
+        <Accordion defaultIndex={[0]} allowToggle>
+          <AccordionItem>
+            <AccordionButton p={0} fontSize="inherit">
+              <Box flex="1" textAlign="left">
+                <Text as="strong" size="lg">
+                  Task Documentation:

Review Comment:
   Small nit, would propose headline without colon.
   ```suggestion
                     Task Documentation
   ```



##########
airflow/www/static/js/api/useTaskDetail.tsx:
##########
@@ -0,0 +1,34 @@
+/*!
+ * 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 axios, { AxiosResponse } from "axios";
+import type { API } from "src/types";
+import { useQuery } from "react-query";
+import { getMetaValue } from "../utils";
+
+const taskDetailURI = getMetaValue("task_detail_api");
+
+export default function useTaskDetail({ taskId }: { taskId: string }) {
+  return useQuery(["taskDetails", taskId], async () => {
+    const url = taskDetailURI.replace("_TASK_ID_", taskId);
+
+    const datum = await axios.get<AxiosResponse, API.Task>(url);
+    return datum;

Review Comment:
   Small nit, does it make sense to define a const just to return the same? Can 
be a one-liner
   ```suggestion
       return await axios.get<AxiosResponse, API.Task>(url);
   ```



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