Loki: Add formatting for annotations (#34774)

* add formatting for loki annotations

based/copied from the same features from the prometheus datasource

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

@@ -444,8 +444,8 @@ describe('LokiDatasource', () => {
   });
 
   describe('when calling annotationQuery', () => {
-    const getTestContext = (response: any) => {
+    const getTestContext = (response: any, options: any = []) => {
-      const query = makeAnnotationQueryRequest();
+      const query = makeAnnotationQueryRequest(options);
       fetchMock.mockImplementation(() => of(response));
 
       const ds = createLokiDSForTests();
@@ -491,6 +491,58 @@ describe('LokiDatasource', () => {
       expect(res[1].text).toBe('hello 2');
       expect(res[1].tags).toEqual(['value2']);
     });
+    describe('Formatting', () => {
+      const response: FetchResponse = ({
+        data: {
+          data: {
+            resultType: LokiResultType.Stream,
+            result: [
+              {
+                stream: {
+                  label: 'value',
+                  label2: 'value2',
+                  label3: 'value3',
+                },
+                values: [['1549016857498000000', 'hello']],
+              },
+            ],
+          },
+          status: 'success',
+        },
+      } as unknown) as FetchResponse;
+      describe('When tagKeys is set', () => {
+        it('should only include selected labels', async () => {
+          const { promise } = getTestContext(response, { tagKeys: 'label2,label3' });
+
+          const res = await promise;
+
+          expect(res.length).toBe(1);
+          expect(res[0].text).toBe('hello');
+          expect(res[0].tags).toEqual(['value2', 'value3']);
+        });
+      });
+      describe('When textFormat is set', () => {
+        it('should fromat the text accordingly', async () => {
+          const { promise } = getTestContext(response, { textFormat: 'hello {{label2}}' });
+
+          const res = await promise;
+
+          expect(res.length).toBe(1);
+          expect(res[0].text).toBe('hello value2');
+        });
+      });
+      describe('When titleFormat is set', () => {
+        it('should fromat the title accordingly', async () => {
+          const { promise } = getTestContext(response, { titleFormat: 'Title {{label2}}' });
+
+          const res = await promise;
+
+          expect(res.length).toBe(1);
+          expect(res[0].title).toBe('Title value2');
+          expect(res[0].text).toBe('hello');
+        });
+      });
+    });
   });
 
   describe('metricFindQuery', () => {
@@ -552,7 +604,7 @@ function createLokiDSForTests(
   return new LokiDatasource(customSettings, templateSrvMock, timeSrvStub as any);
 }
 
-function makeAnnotationQueryRequest(): AnnotationQueryRequest<LokiQuery> {
+function makeAnnotationQueryRequest(options: any): AnnotationQueryRequest<LokiQuery> {
   const timeRange = {
     from: dateTime(),
     to: dateTime(),
@@ -565,6 +617,7 @@ function makeAnnotationQueryRequest(): AnnotationQueryRequest<LokiQuery> {
       enable: true,
       name: 'test-annotation',
       iconColor: 'red',
+      ...options,
     },
     dashboard: {
       id: 1,

public/app/plugins/datasource/loki/datasource.ts

@@ -492,8 +492,8 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
       .toPromise();
   }
 
-  async annotationQuery(options: AnnotationQueryRequest<LokiQuery>): Promise<AnnotationEvent[]> {
+  async annotationQuery(options: any): Promise<AnnotationEvent[]> {
-    const { expr, maxLines, instant } = options.annotation;
+    const { expr, maxLines, instant, tagKeys = '', titleFormat = '', textFormat = '' } = options.annotation;
 
     if (!expr) {
       return [];
@@ -506,26 +506,40 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
       : await this.runRangeQuery(query, options as any).toPromise();
 
     const annotations: AnnotationEvent[] = [];
+    const splitKeys: string[] = tagKeys.split(',').filter((v: string) => v !== '');
 
     for (const frame of data) {
-      const tags: string[] = [];
+      const labels: { [key: string]: string } = {};
       for (const field of frame.fields) {
         if (field.labels) {
-          tags.push.apply(tags, [
+          for (const [key, value] of Object.entries(field.labels)) {
+            labels[key] = String(value).trim();
+          }
+        }
+      }
+
+      const tags: string[] = [
         ...new Set(
-              Object.values(field.labels)
+          Object.entries(labels).reduce((acc: string[], [key, val]) => {
-                .map((label: string) => label.trim())
+            if (val === '') {
-                .filter((label: string) => label !== '')
+              return acc;
+            }
+            if (splitKeys.length && !splitKeys.includes(key)) {
+              return acc;
+            }
+            acc.push.apply(acc, [val]);
+            return acc;
+          }, [])
         ),
-          ]);
+      ];
-        }
+
-      }
       const view = new DataFrameView<{ ts: string; line: string }>(frame);
 
       view.forEach((row) => {
         annotations.push({
           time: new Date(row.ts).valueOf(),
-          text: row.line,
+          title: renderTemplate(titleFormat, labels),
+          text: renderTemplate(textFormat, labels) || row.line,
           tags,
         });
       });
@@ -566,6 +580,16 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
   }
 }
 
+export function renderTemplate(aliasPattern: string, aliasData: { [key: string]: string }) {
+  const aliasRegex = /\{\{\s*(.+?)\s*\}\}/g;
+  return aliasPattern.replace(aliasRegex, (_match, g1) => {
+    if (aliasData[g1]) {
+      return aliasData[g1];
+    }
+    return '';
+  });
+}
+
 export function lokiRegularEscape(value: any) {
   if (typeof value === 'string') {
     return value.replace(/'/g, "\\\\'");

public/app/plugins/datasource/loki/partials/annotations.editor.html

@@ -4,4 +4,25 @@
   instant="ctrl.annotation.instant"
   on-change="ctrl.onQueryChange"
   datasource="ctrl.datasource"
-/>
+>
+</loki-annotations-query-editor>
+
+<div class="gf-form-group">
+	<h5 class="section-heading">Field formats<tip>For title and text fields, use either the name or a pattern. For example, {{instance}} is replaced with label value for the label instance.</tip></h5>
+	<div class="gf-form-inline">
+		<div class="gf-form">
+			<span class="gf-form-label width-5">Title</span>
+			<input type="text" class="gf-form-input max-width-9" ng-model='ctrl.annotation.titleFormat' placeholder="alertname"></input>
+		</div>
+		<div class="gf-form">
+			<span class="gf-form-label width-5">Tags</span>
+			<input type="text" class="gf-form-input max-width-9" ng-model='ctrl.annotation.tagKeys' placeholder="label1,label2"></input>
+		</div>
+		<div class="gf-form-inline">
+			<div class="gf-form">
+				<span class="gf-form-label width-5">Text</span>
+				<input type="text" class="gf-form-input max-width-9" ng-model='ctrl.annotation.textFormat' placeholder="instance"></input>
+			</div>
+		</div>
+	</div>
+</div>