Revert "Prometheus: Remove series endpoint call from Metrics Explorer" (#105104)

Revert "Prometheus: Remove series endpoint call from Metrics Explorer (#104263)"

This reverts commit 89198bb749.

packages/grafana-prometheus/src/metric_find_query.test.ts

@@ -147,11 +147,15 @@ describe('PrometheusMetricFindQuery', () => {
     });
 
     // <LegacyPrometheus>
-    it('label_values(metric, resource) should generate label/__name__/values query with correct time', async () => {
+    it('label_values(metric, resource) should generate series query with correct time', async () => {
       const query = setupMetricFindQuery({
         query: 'label_values(metric, resource)',
         response: {
-          data: ['value1', 'value2', 'value3'],
+          data: [
+            { __name__: 'metric', resource: 'value1' },
+            { __name__: 'metric', resource: 'value2' },
+            { __name__: 'metric', resource: 'value3' },
+          ],
         },
       });
       const results = await query.process(raw);
@@ -160,19 +164,24 @@ describe('PrometheusMetricFindQuery', () => {
       expect(fetchMock).toHaveBeenCalledTimes(1);
       expect(fetchMock).toHaveBeenCalledWith({
         method: 'GET',
-        url: `/api/datasources/uid/ABCDEF/resources/api/v1/label/resource/values?match${encodeURIComponent(
+        url: `/api/datasources/uid/ABCDEF/resources/api/v1/series?match${encodeURIComponent(
           '[]'
         )}=metric&start=${raw.from.unix()}&end=${raw.to.unix()}`,
         hideFromInspector: true,
+        showErrorAlert: false,
         headers: {},
       });
     });
 
-    it('label_values(metric{label1="foo", label2="bar", label3="baz"}, resource) should generate label/__name__/values? query with correct time', async () => {
+    it('label_values(metric{label1="foo", label2="bar", label3="baz"}, resource) should generate series query with correct time', async () => {
       const query = setupMetricFindQuery({
         query: 'label_values(metric{label1="foo", label2="bar", label3="baz"}, resource)',
         response: {
-          data: ['value1', 'value2', 'value3'],
+          data: [
+            { __name__: 'metric', resource: 'value1' },
+            { __name__: 'metric', resource: 'value2' },
+            { __name__: 'metric', resource: 'value3' },
+          ],
         },
       });
       const results = await query.process(raw);
@@ -181,8 +190,9 @@ describe('PrometheusMetricFindQuery', () => {
       expect(fetchMock).toHaveBeenCalledTimes(1);
       expect(fetchMock).toHaveBeenCalledWith({
         method: 'GET',
-        url: '/api/datasources/uid/ABCDEF/resources/api/v1/label/resource/values?match%5B%5D=metric%7Blabel1%3D%22foo%22%2C%20label2%3D%22bar%22%2C%20label3%3D%22baz%22%7D&start=1524650400&end=1524654000',
+        url: '/api/datasources/uid/ABCDEF/resources/api/v1/series?match%5B%5D=metric%7Blabel1%3D%22foo%22%2C%20label2%3D%22bar%22%2C%20label3%3D%22baz%22%7D&start=1524650400&end=1524654000',
         hideFromInspector: true,
+        showErrorAlert: false,
         headers: {},
       });
     });
@@ -191,7 +201,11 @@ describe('PrometheusMetricFindQuery', () => {
       const query = setupMetricFindQuery({
         query: 'label_values(metric, resource)',
         response: {
-          data: ['value1', 'value2'],
+          data: [
+            { __name__: 'metric', resource: 'value1' },
+            { __name__: 'metric', resource: 'value2' },
+            { __name__: 'metric', resource: '' },
+          ],
         },
       });
       const results = await query.process(raw);
@@ -202,10 +216,11 @@ describe('PrometheusMetricFindQuery', () => {
       expect(fetchMock).toHaveBeenCalledTimes(1);
       expect(fetchMock).toHaveBeenCalledWith({
         method: 'GET',
-        url: `/api/datasources/uid/ABCDEF/resources/api/v1/label/resource/values?match${encodeURIComponent(
+        url: `/api/datasources/uid/ABCDEF/resources/api/v1/series?match${encodeURIComponent(
           '[]'
         )}=metric&start=${raw.from.unix()}&end=${raw.to.unix()}`,
         hideFromInspector: true,
+        showErrorAlert: false,
         headers: {},
       });
     });

packages/grafana-prometheus/src/metric_find_query.ts

@@ -87,17 +87,23 @@ export class PrometheusMetricFindQuery {
       escapedLabel = escapeForUtf8Support(label);
     }
 
-    const url = `/api/v1/label/${escapedLabel}/values`;
-
     if (!metric || this.datasource.hasLabelsMatchAPISupport()) {
+      const url = `/api/v1/label/${escapedLabel}/values`;
+
       return this.datasource.metadataRequest(url, params).then((result) => {
         return _map(result.data.data, (value) => {
           return { text: value };
         });
       });
     } else {
+      const url = `/api/v1/series`;
+
       return this.datasource.metadataRequest(url, params).then((result) => {
-        const _labels = _map(result.data.data, (metric) => metric);
+        const _labels = _map(result.data.data, (metric) => {
+          return metric[label] || '';
+        }).filter((label) => {
+          return label !== '';
+        });
 
         return uniq(_labels).map((metric) => {
           return {