Azure Monitor: Use default from datasource if not saved on dashboard/query (#20899)

* use default from datasource if not saved on dash/query

* find datasource default workspace in returned workspace list

* don't need the find

* fix dropdown

public/app/plugins/datasource/grafana-azure-monitor-datasource/azure_log_analytics/azure_log_analytics_datasource.ts

@@ -87,7 +87,11 @@ export default class AzureLogAnalyticsDatasource {
       );
       const generated = querystringBuilder.generate();
 
-      const workspace = this.templateSrv.replace(item.workspace, options.scopedVars);
+      let workspace = this.templateSrv.replace(item.workspace, options.scopedVars);
+
+      if (!workspace && this.defaultOrFirstWorkspace) {
+        workspace = this.defaultOrFirstWorkspace;
+      }
 
       const url = `${this.baseUrl}/${workspace}/query?${generated.uriString}`;
 

public/app/plugins/datasource/grafana-azure-monitor-datasource/partials/query.editor.html

@@ -118,7 +118,7 @@
       <div class="gf-form">
         <label class="gf-form-label query-keyword width-9">Workspace</label>
         <gf-form-dropdown model="ctrl.target.azureLogAnalytics.workspace" allow-custom="true" lookup-text="true"
-          get-options="ctrl.workspaces" on-change="ctrl.refresh()" css-class="min-width-12">
+          get-options="ctrl.getWorkspaces()" on-change="ctrl.refresh()" css-class="min-width-12">
         </gf-form-dropdown>
         <div class="gf-form">
           <div class="width-1"></div>

public/app/plugins/datasource/grafana-azure-monitor-datasource/query_ctrl.ts

@@ -537,9 +537,18 @@ export class AzureMonitorQueryCtrl extends QueryCtrl {
       .getWorkspaces(this.target.subscription)
       .then((list: any[]) => {
         this.workspaces = list;
+
         if (list.length > 0 && !this.target.azureLogAnalytics.workspace) {
-          this.target.azureLogAnalytics.workspace = list[0].value;
+          if (this.datasource.azureLogAnalyticsDatasource.defaultOrFirstWorkspace) {
+            this.target.azureLogAnalytics.workspace = this.datasource.azureLogAnalyticsDatasource.defaultOrFirstWorkspace;
+          }
+
+          if (!this.target.azureLogAnalytics.workspace) {
+            this.target.azureLogAnalytics.workspace = list[0].value;
+          }
         }
+
+        return this.workspaces;
       })
       .catch(this.handleQueryCtrlError.bind(this));
   };