Tempo: Add link to Tempo Search with node service selected (#49776)

* Node to tempo search with service selected

* Tests

* Update link text

* Update test

public/app/plugins/datasource/tempo/datasource.test.ts

@@ -174,7 +174,7 @@ describe('Tempo data source', () => {
     expect(response.data[0].fields[0].values.length).toBe(3);
 
     // Test Links
-    expect(response.data[0].fields[0].config.links.length).toBeGreaterThan(0);
+    expect(response.data[0].fields[0].config.links.length).toBe(4);
     expect(response.data[0].fields[0].config.links).toEqual(serviceGraphLinks);
 
     expect(response.data[1].name).toBe('Edges');
@@ -493,4 +493,16 @@ const serviceGraphLinks = [
       datasourceName: 'Prometheus',
     },
   },
+  {
+    url: '',
+    title: 'View traces',
+    internal: {
+      query: {
+        queryType: 'nativeSearch',
+        serviceName: '${__data.fields[0]}',
+      } as TempoQuery,
+      datasourceUid: 'tempo',
+      datasourceName: 'Tempo',
+    },
+  },
 ];

public/app/plugins/datasource/tempo/datasource.ts

@@ -202,7 +202,7 @@ export class TempoDatasource extends DataSourceWithBackend<TempoQuery, TempoJson
     }
 
     if (this.serviceMap?.datasourceUid && targets.serviceMap?.length > 0) {
-      subQueries.push(serviceMapQuery(options, this.serviceMap.datasourceUid));
+      subQueries.push(serviceMapQuery(options, this.serviceMap.datasourceUid, this.name));
     }
 
     if (targets.traceId?.length > 0) {
@@ -396,7 +396,7 @@ function queryServiceMapPrometheus(request: DataQueryRequest<PromQuery>, datasou
   );
 }
 
-function serviceMapQuery(request: DataQueryRequest<TempoQuery>, datasourceUid: string) {
+function serviceMapQuery(request: DataQueryRequest<TempoQuery>, datasourceUid: string, tempoDatasourceUid: string) {
   return queryServiceMapPrometheus(makePromServiceMapRequest(request), datasourceUid).pipe(
     // Just collect all the responses first before processing into node graph data
     toArray(),
@@ -424,6 +424,7 @@ function serviceMapQuery(request: DataQueryRequest<TempoQuery>, datasourceUid: s
             `rate(${failedMetric}{server="\${__data.fields.id}"}[$__rate_interval])`,
             datasourceUid
           ),
+          makeTempoLink('View traces', `\${__data.fields[0]}`, tempoDatasourceUid),
         ],
       };
 
@@ -449,6 +450,21 @@ function makePromLink(title: string, metric: string, datasourceUid: string) {
   };
 }
 
+function makeTempoLink(title: string, serviceName: string, datasourceUid: string) {
+  return {
+    url: '',
+    title,
+    internal: {
+      query: {
+        queryType: 'nativeSearch',
+        serviceName: serviceName,
+      } as TempoQuery,
+      datasourceUid: datasourceUid,
+      datasourceName: 'Tempo',
+    },
+  };
+}
+
 function makePromServiceMapRequest(options: DataQueryRequest<TempoQuery>): DataQueryRequest<PromQuery> {
   return {
     ...options,