Explore: Fix click to filter for recording rule expressions

- recording rule names contain ':'
- include this in the pattern for metric names

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

@@ -15,7 +15,7 @@ const builtInWords = [
   .join('|')
   .split('|');
 
-const metricNameRegexp = /([A-Za-z]\w*)\b(?![\(\]{=!",])/g;
+const metricNameRegexp = /([A-Za-z:][\w:]*)\b(?![\(\]{=!",])/g;
 const selectorRegexp = /{([^{]*)}/g;
 
 // addLabelToQuery('foo', 'bar', 'baz') => 'foo{bar="baz"}'

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

@@ -28,6 +28,7 @@ describe('addLabelToQuery()', () => {
     expect(addLabelToQuery('foo{instance="my-host.com:9100"}', 'bar', 'baz')).toBe(
       'foo{bar="baz",instance="my-host.com:9100"}'
     );
+    expect(addLabelToQuery('foo:metric:rate1m', 'bar', 'baz')).toBe('foo:metric:rate1m{bar="baz"}');
     expect(addLabelToQuery('foo{list="a,b,c"}', 'bar', 'baz')).toBe('foo{bar="baz",list="a,b,c"}');
   });