Prometheus: Return labels in query results (#18535)

* Added prometheus metric labels to data returned for normal time series queries

* Fixed result transformer tests for new return layout with prometheus labels

* Fixed prettier formatting

public/app/plugins/datasource/prometheus/result_transformer.ts

@@ -76,6 +76,7 @@ export class ResultTransformer {
       datapoints: dps,
       query: options.query,
       target: metricLabel,
+      labels: metricData.metric,
     };
   }
 

public/app/plugins/datasource/prometheus/specs/result_transformer.test.ts

@@ -147,9 +147,24 @@ describe('Prometheus Result Transformer', () => {
 
       const result = ctx.resultTransformer.transform({ data: response }, options);
       expect(result).toEqual([
-        { target: '1', datapoints: [[10, 1445000010000], [10, 1445000020000], [0, 1445000030000]] },
-        { target: '2', datapoints: [[10, 1445000010000], [0, 1445000020000], [30, 1445000030000]] },
-        { target: '3', datapoints: [[10, 1445000010000], [0, 1445000020000], [10, 1445000030000]] },
+        {
+          target: '1',
+          query: undefined,
+          datapoints: [[10, 1445000010000], [10, 1445000020000], [0, 1445000030000]],
+          labels: { __name__: 'test', job: 'testjob', le: '1' },
+        },
+        {
+          target: '2',
+          query: undefined,
+          datapoints: [[10, 1445000010000], [0, 1445000020000], [30, 1445000030000]],
+          labels: { __name__: 'test', job: 'testjob', le: '2' },
+        },
+        {
+          target: '3',
+          query: undefined,
+          datapoints: [[10, 1445000010000], [0, 1445000020000], [10, 1445000030000]],
+          labels: { __name__: 'test', job: 'testjob', le: '3' },
+        },
       ]);
     });
 
@@ -205,7 +220,14 @@ describe('Prometheus Result Transformer', () => {
       };
 
       const result = ctx.resultTransformer.transform({ data: response }, options);
-      expect(result).toEqual([{ target: 'test{job="testjob"}', datapoints: [[10, 0], [10, 1000], [0, 2000]] }]);
+      expect(result).toEqual([
+        {
+          target: 'test{job="testjob"}',
+          query: undefined,
+          datapoints: [[10, 0], [10, 1000], [0, 2000]],
+          labels: { job: 'testjob' },
+        },
+      ]);
     });
 
     it('should fill timeseries with null values', () => {
@@ -229,7 +251,14 @@ describe('Prometheus Result Transformer', () => {
       };
 
       const result = ctx.resultTransformer.transform({ data: response }, options);
-      expect(result).toEqual([{ target: 'test{job="testjob"}', datapoints: [[null, 0], [10, 1000], [0, 2000]] }]);
+      expect(result).toEqual([
+        {
+          target: 'test{job="testjob"}',
+          query: undefined,
+          datapoints: [[null, 0], [10, 1000], [0, 2000]],
+          labels: { job: 'testjob' },
+        },
+      ]);
     });
 
     it('should align null values with step', () => {
@@ -254,7 +283,12 @@ describe('Prometheus Result Transformer', () => {
 
       const result = ctx.resultTransformer.transform({ data: response }, options);
       expect(result).toEqual([
-        { target: 'test{job="testjob"}', datapoints: [[null, 0], [null, 2000], [10, 4000], [null, 6000], [10, 8000]] },
+        {
+          target: 'test{job="testjob"}',
+          query: undefined,
+          datapoints: [[null, 0], [null, 2000], [10, 4000], [null, 6000], [10, 8000]],
+          labels: { job: 'testjob' },
+        },
       ]);
     });
   });