Migration v15: No-op migration for schema consistency (#109604)

* migrate to v19

* migrate to v18

* Migration to be verified: v17 Convert minSpan to maxPerRow in panels

* Migration to be verified: 16 Grid layout migration

* Refactor v17 and v19 migrations to use shared helper functions

* Migration to be verified: 15 No-op migration for schema consistency

* Update v27.go

* Update v16.go

* cleanup

---------

Co-authored-by: Haris Rozajac <haris.rozajac12@gmail.com>
Co-authored-by: Haris Rozajac <58232930+harisrozajac@users.noreply.github.com>

apps/dashboard/pkg/migration/schemaversion/migrations.go

@@ -5,7 +5,7 @@ import (
 )
 
 const (
-	MIN_VERSION    = 15
+	MIN_VERSION    = 14
 	LATEST_VERSION = 41
 )
 
@@ -38,6 +38,7 @@ type PanelPluginInfoProvider interface {
 
 func GetMigrations(dsInfoProvider DataSourceInfoProvider, panelProvider PanelPluginInfoProvider) map[int]SchemaVersionMigrationFunc {
 	return map[int]SchemaVersionMigrationFunc{
+		15: V15,
 		16: V16,
 		17: V17,
 		18: V18,

apps/dashboard/pkg/migration/schemaversion/v15.go

@@ -0,0 +1,25 @@
+package schemaversion
+
+// V15 migration is a no-op migration
+// It only updates the schema version to 15
+// It's created to keep the migration history consistent with frontend migrator
+// No specific migration logic is needed between schema version 14 and 15
+
+// Example before migration:
+// {
+//   "schemaVersion": 14,
+//   "title": "My Dashboard",
+//   "panels": [...]
+// }
+
+// Example after migration:
+// {
+//   "schemaVersion": 15,
+//   "title": "My Dashboard",
+//   "panels": [...]
+// }
+
+func V15(dashboard map[string]interface{}) error {
+	dashboard["schemaVersion"] = 15
+	return nil
+}

apps/dashboard/pkg/migration/schemaversion/v15_test.go

@@ -0,0 +1,38 @@
+package schemaversion_test
+
+import (
+	"testing"
+
+	"github.com/grafana/grafana/apps/dashboard/pkg/migration/schemaversion"
+)
+
+func TestV15(t *testing.T) {
+	tests := []migrationTestCase{
+		{
+			name: "v15 no-op migration, updates schema version only",
+			input: map[string]interface{}{
+				"title":         "V15 No-Op Migration Test Dashboard",
+				"schemaVersion": 14,
+				"panels": []interface{}{
+					map[string]interface{}{
+						"type":  "graph",
+						"title": "Panel remains unchanged",
+						"id":    1,
+					},
+				},
+			},
+			expected: map[string]interface{}{
+				"title":         "V15 No-Op Migration Test Dashboard",
+				"schemaVersion": 15,
+				"panels": []interface{}{
+					map[string]interface{}{
+						"type":  "graph",
+						"title": "Panel remains unchanged",
+						"id":    1,
+					},
+				},
+			},
+		},
+	}
+	runMigrationTests(t, tests, schemaversion.V15)
+}

apps/dashboard/pkg/migration/testdata/input/v15.no-op-migration.json

@@ -0,0 +1,58 @@
+{
+    "title": "V15 No-Op Migration Test Dashboard",
+    "schemaVersion": 14,
+    "panels": [
+      {
+        "type": "graph",
+        "title": "CPU Usage",
+        "id": 1,
+        "yAxes": [
+          {
+            "show": true,
+            "min": null,
+            "max": null
+          }
+        ]
+      },
+      {
+        "type": "singlestat", 
+        "title": "Memory Usage",
+        "id": 2,
+        "valueMaps": [
+          {
+            "op": "=",
+            "text": "N/A",
+            "value": "null"
+          }
+        ]
+      }
+    ],
+    "templating": {
+      "list": [
+        {
+          "name": "server",
+          "type": "query",
+          "datasource": "prometheus",
+          "query": "label_values(server)",
+          "refresh": 1,
+          "options": []
+        }
+      ]
+    },
+    "annotations": {
+      "list": [
+        {
+          "name": "Annotations & Alerts",
+          "datasource": "grafana",
+          "enable": true
+        }
+      ]
+    },
+    "time": {
+      "from": "now-6h",
+      "to": "now"
+    },
+    "timepicker": {
+      "refresh_intervals": ["5s", "10s", "30s", "1m", "5m", "15m", "30m", "1h", "2h", "1d"]
+    }
+  }

apps/dashboard/pkg/migration/testdata/output/v15.no-op-migration.json

@@ -0,0 +1,145 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "datasource": {
+          "uid": "grafana"
+        },
+        "enable": true,
+        "name": "Annotations \u0026 Alerts"
+      }
+    ]
+  },
+  "panels": [
+    {
+      "datasource": {
+        "apiVersion": "v1",
+        "type": "prometheus",
+        "uid": "default-ds-uid"
+      },
+      "id": 1,
+      "targets": [
+        {
+          "datasource": {
+            "apiVersion": "v1",
+            "type": "prometheus",
+            "uid": "default-ds-uid"
+          },
+          "refId": "A"
+        }
+      ],
+      "title": "CPU Usage",
+      "type": "graph",
+      "yAxes": [
+        {
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ]
+    },
+    {
+      "datasource": {
+        "apiVersion": "v1",
+        "type": "prometheus",
+        "uid": "default-ds-uid"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "mappings": [
+            {
+              "options": {
+                "match": "null",
+                "result": {
+                  "color": null,
+                  "text": "N/A"
+                }
+              },
+              "type": "special"
+            }
+          ],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "id": 2,
+      "options": {
+        "colorMode": "none",
+        "graphMode": "none",
+        "justifyMode": "auto",
+        "orientation": "horizontal",
+        "percentChangeColorMode": "standard",
+        "reduceOptions": {
+          "calcs": [
+            "mean"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "showPercentChange": false,
+        "textMode": "auto",
+        "wideLayout": true
+      },
+      "pluginVersion": "1.0.0",
+      "targets": [
+        {
+          "datasource": {
+            "apiVersion": "v1",
+            "type": "prometheus",
+            "uid": "default-ds-uid"
+          },
+          "refId": "A"
+        }
+      ],
+      "title": "Memory Usage",
+      "type": "stat"
+    }
+  ],
+  "refresh": "",
+  "schemaVersion": 41,
+  "templating": {
+    "list": [
+      {
+        "datasource": {
+          "uid": "prometheus"
+        },
+        "name": "server",
+        "options": [],
+        "query": "label_values(server)",
+        "refresh": 1,
+        "type": "query"
+      }
+    ]
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "timepicker": {
+    "refresh_intervals": [
+      "5s",
+      "10s",
+      "30s",
+      "1m",
+      "5m",
+      "15m",
+      "30m",
+      "1h",
+      "2h",
+      "1d"
+    ]
+  },
+  "title": "V15 No-Op Migration Test Dashboard"
+}