Add run type legend tooltip to grid view

airflow-core/src/airflow/ui/public/i18n/locales/en/dag.json

@@ -45,7 +45,8 @@
     "buttons": {
       "resetToLatest": "Reset to latest",
       "toggleGroup": "Toggle group"
-    }
+    },
+    "runTypeLegend": "Run Type Legend"
   },
   "header": {
     "buttons": {

airflow-core/src/airflow/ui/src/layouts/Details/Grid/GridLegend.tsx

@@ -0,0 +1,51 @@
+/*!
+ * 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, Flex, Text } from "@chakra-ui/react";
+import { useTranslation } from "react-i18next";
+import { LuInfo } from "react-icons/lu";
+
+import type { DAGRunResponse } from "openapi/requests/types.gen";
+import { RunTypeIcon } from "src/components/RunTypeIcon";
+import { Tooltip } from "src/components/ui";
+
+const runTypes: Array<DAGRunResponse["run_type"]> = ["scheduled", "manual", "backfill", "asset_triggered"];
+
+export const GridLegend = () => {
+  const { t: translate } = useTranslation("common");
+
+  return (
+    <Tooltip
+      content={
+        <Box>
+          {runTypes.map((runType) => (
+            <Flex align="center" gap={2} key={runType}>
+              <RunTypeIcon runType={runType} />
+              <Text fontSize="xs">{translate(`runTypes.${runType}`)}</Text>
+            </Flex>
+          ))}
+        </Box>
+      }
+      portalled
+    >
+      <Box as="span" cursor="pointer">
+        <LuInfo />
+      </Box>
+    </Tooltip>
+  );
+};

airflow-core/src/airflow/ui/src/layouts/Details/PanelButtons.tsx

@@ -56,6 +56,7 @@ import { dagRunTypeOptions, dagRunStateOptions } from "src/constants/stateOption
 import { useContainerWidth } from "src/utils/useContainerWidth";
 
 import { DagRunSelect } from "./DagRunSelect";
+import { GridLegend } from "./Grid/GridLegend";
 import { TaskStreamFilter } from "./TaskStreamFilter";
 import { ToggleGroups } from "./ToggleGroups";
 import { VersionIndicatorSelect } from "./VersionIndicatorSelect";
@@ -493,7 +494,8 @@ export const PanelButtons = ({
       </Flex>
 
       {dagView === "grid" && (
-        <Flex color="fg.muted" justifyContent="flex-end" mt={1}>
+        <Flex color="fg.muted" gap={2} justifyContent="flex-end" mt={1}>
+          <GridLegend />
           <Tooltip
             content={
               <Box>