Keep __name__ tag in results

prometheus/converters.go

@@ -46,10 +46,9 @@ func WriteRequestToPoints(req *remote.WriteRequest) ([]models.Point, error) {
 
 		tags := make(map[string]string, len(ts.Labels))
 		for _, l := range ts.Labels {
+			tags[l.Name] = l.Value
 			if l.Name == prometheusNameTag {
 				measurement = l.Value
-			} else {
-				tags[l.Name] = l.Value
 			}
 		}
 

tests/server_test.go

@@ -9639,7 +9639,7 @@ func TestServer_Prometheus_Write(t *testing.T) {
 		&Query{
 			name:    "selecting the data should return it",
 			command: `SELECT * FROM db0.rp0.cpu`,
-			exp:     fmt.Sprintf(`{"results":[{"statement_id":0,"series":[{"name":"cpu","columns":["time","host","value"],"values":[["%s","a",100],["%s","b",200]]}]}]}`, now.Format(time.RFC3339Nano), now.Add(10*time.Millisecond).Format(time.RFC3339Nano)),
+			exp:     fmt.Sprintf(`{"results":[{"statement_id":0,"series":[{"name":"cpu","columns":["time","__name__","host","value"],"values":[["%s","cpu","a",100],["%s","cpu","b",200]]}]}]}`, now.Format(time.RFC3339Nano), now.Add(10*time.Millisecond).Format(time.RFC3339Nano)),
 		},
 	)