better input switching

dashboards/home-metrics.json

@@ -27,7 +27,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "PBFA97CFB590B2093"
+        "uid": "${datasource}"
       },
       "fieldConfig": {
         "defaults": {
@@ -104,7 +104,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "PBFA97CFB590B2093"
+            "uid": "${datasource}"
           },
           "disableTextWrap": false,
           "editorMode": "builder",
@@ -124,7 +124,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "PBFA97CFB590B2093"
+        "uid": "${datasource}"
       },
       "fieldConfig": {
         "defaults": {
@@ -232,7 +232,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "PBFA97CFB590B2093"
+            "uid": "${datasource}"
           },
           "disableTextWrap": false,
           "editorMode": "builder",
@@ -248,7 +248,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "PBFA97CFB590B2093"
+            "uid": "${datasource}"
           },
           "disableTextWrap": false,
           "editorMode": "builder",
@@ -269,7 +269,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "PBFA97CFB590B2093"
+        "uid": "${datasource}"
       },
       "fieldConfig": {
         "defaults": {
@@ -354,7 +354,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "PBFA97CFB590B2093"
+            "uid": "${datasource}"
           },
           "disableTextWrap": false,
           "editorMode": "builder",
@@ -374,7 +374,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "PBFA97CFB590B2093"
+        "uid": "${datasource}"
       },
       "fieldConfig": {
         "defaults": {
@@ -454,7 +454,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "PBFA97CFB590B2093"
+            "uid": "${datasource}"
           },
           "disableTextWrap": false,
           "editorMode": "builder",
@@ -476,7 +476,26 @@
   "schemaVersion": 39,
   "tags": [],
   "templating": {
-    "list": []
+    "list": [
+      {
+        "current": {
+          "selected": true,
+          "text": "prometheus",
+          "value": "PBFA97CFB590B2093"
+        },
+        "hide": 0,
+        "includeAll": false,
+        "multi": false,
+        "name": "datasource",
+        "options": [],
+        "query": "prometheus",
+        "queryValue": "",
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "type": "datasource"
+      }
+    ]
   },
   "time": {
     "from": "now-7d",