[v9.3.x] Azure Monitor: Fix namespace selection for storageaccounts (#59184)

Azure Monitor: Fix namespace selection for storageaccounts (#56449)

(cherry picked from commit 3bea8f2462)

Co-authored-by: Andres Martinez Gotor <andres.martinez@grafana.com>

public/app/plugins/datasource/grafana-azure-monitor-datasource/components/MetricsQueryEditor/setQueryValue.test.ts

@@ -4,8 +4,10 @@ describe('setQueryValue', () => {
   describe('setCustomNamespace', () => {
     it('The metricnamespace must be: microsoft.storage/storageaccounts for storage accounts.', () => {
       const result = setCustomNamespace({ refId: 'A' }, 'microsoft.storage/storageaccounts/fileservices');
-      expect(result.azureMonitor?.customNamespace).toEqual('');
+      expect(result.azureMonitor?.customNamespace).toBeUndefined();
+      expect(result.azureMonitor?.metricNamespace).toEqual('microsoft.storage/storageaccounts/fileservices');
     });
+
     it('Set a custom namespace for non storage accounts.', () => {
       const result = setCustomNamespace({ refId: 'A' }, 'foo/bar');
       expect(result.azureMonitor?.customNamespace).toEqual('foo/bar');

public/app/plugins/datasource/grafana-azure-monitor-datasource/components/MetricsQueryEditor/setQueryValue.ts

@@ -4,13 +4,26 @@ export function setCustomNamespace(query: AzureMonitorQuery, selection: string |
   if (query.azureMonitor?.customNamespace === selection) {
     return query;
   }
-  const customNamespace = selection?.toLowerCase().startsWith('microsoft.storage/storageaccounts/') ? '' : selection;
+
+  if (selection?.toLowerCase().startsWith('microsoft.storage/storageaccounts/')) {
+    return {
+      ...query,
+      azureMonitor: {
+        ...query.azureMonitor,
+        metricNamespace: selection,
+        metricName: undefined,
+        aggregation: undefined,
+        timeGrain: '',
+        dimensionFilters: [],
+      },
+    };
+  }
 
   return {
     ...query,
     azureMonitor: {
       ...query.azureMonitor,
-      customNamespace,
+      customNamespace: selection,
       metricName: undefined,
       aggregation: undefined,
       timeGrain: '',