fix MAX chart not being a dotted line

python/ray/dashboard/modules/metrics/dashboards/common.py

@@ -114,6 +114,7 @@ class Target:
     "datasource": r"${datasource}",
     "description": "<Description>",
     "fieldConfig": {"defaults": {}, "overrides": []},
+    # Setting height and width is important here to ensure the default panel has some size to it.
     "gridPos": {"h": 8, "w": 12, "x": 0, "y": 0},
     "fill": 10,
     "fillGradient": 0,
@@ -143,6 +144,31 @@ class Target:
     "pointradius": 2,
     "points": False,
     "renderer": "flot",
+    # These series overrides are necessary to make the "MAX" and "MAX + PENDING" dotted lines
+    # instead of stacked filled areas.
+    "seriesOverrides": [
+        {
+            "$$hashKey": "object:2987",
+            "alias": "MAX",
+            "dashes": True,
+            "color": "#1F60C4",
+            "fill": 0,
+            "stack": False,
+        },
+        {
+            "$$hashKey": "object:78",
+            "alias": "/FINISHED|FAILED|DEAD|REMOVED|Failed Nodes:/",
+            "hiddenSeries": True,
+        },
+        {
+            "$$hashKey": "object:2987",
+            "alias": "MAX + PENDING",
+            "dashes": True,
+            "color": "#777777",
+            "fill": 0,
+            "stack": False,
+        },
+    ],
     "spaceLength": 10,
     "stack": True,
     "steppedLine": False,

python/ray/tests/test_metrics_head.py

@@ -147,6 +147,21 @@ def test_metrics_folder_with_dashboard_override(
             for panel in contents["panels"]:
                 assert panel["gridPos"]["h"] > 0
                 assert panel["gridPos"]["w"] > 0
+            # Check for series overrides for MAX and MAX + PENDING
+            found_max = False
+            found_max_pending = False
+            for panel in contents["panels"]:
+                for override in panel.get("seriesOverrides", []):
+                    if override.get("alias") == "MAX":
+                        assert override["fill"] == 0
+                        assert override["stack"] is False
+                        found_max = True
+                    if override.get("alias") == "MAX + PENDING":
+                        assert override["fill"] == 0
+                        assert override["stack"] is False
+                        found_max_pending = True
+            assert found_max
+            assert found_max_pending
 
         # Serve Dashboard
         with open(f"{override_dashboard_dir}/serve_grafana_dashboard.json") as f: