stackdriver: remove metric.category alias pattern

After discussions with the Stackdriver team, they did not think this was
needed.

pkg/tsdb/stackdriver/stackdriver.go

@@ -29,10 +29,9 @@ import (
 )
 
 var (
-	slog                  log.Logger
-	legendKeyFormat       *regexp.Regexp
-	longMetricNameFormat  *regexp.Regexp
-	shortMetricNameFormat *regexp.Regexp
+	slog             log.Logger
+	legendKeyFormat  *regexp.Regexp
+	metricNameFormat *regexp.Regexp
 )
 
 // StackdriverExecutor executes queries for the Stackdriver datasource
@@ -58,8 +57,7 @@ func init() {
 	slog = log.New("tsdb.stackdriver")
 	tsdb.RegisterTsdbQueryEndpoint("stackdriver", NewStackdriverExecutor)
 	legendKeyFormat = regexp.MustCompile(`\{\{\s*(.+?)\s*\}\}`)
-	longMetricNameFormat = regexp.MustCompile(`([\w\d_]+)\.googleapis\.com/([\w\d_]+)/(.+)`)
-	shortMetricNameFormat = regexp.MustCompile(`([\w\d_]+)\.googleapis\.com/(.+)`)
+	metricNameFormat = regexp.MustCompile(`([\w\d_]+)\.googleapis\.com/(.+)`)
 }
 
 // Query takes in the frontend queries, parses them into the Stackdriver query format
@@ -410,27 +408,16 @@ func formatLegendKeys(metricType string, defaultMetricName string, metricLabels
 
 func replaceWithMetricPart(metaPartName string, metricType string) []byte {
 	// https://cloud.google.com/monitoring/api/v3/metrics-details#label_names
-	longMatches := longMetricNameFormat.FindStringSubmatch(metricType)
-	shortMatches := shortMetricNameFormat.FindStringSubmatch(metricType)
+	shortMatches := metricNameFormat.FindStringSubmatch(metricType)
 
 	if metaPartName == "metric.name" {
-		if len(longMatches) > 0 {
-			return []byte(longMatches[3])
-		} else if len(shortMatches) > 0 {
+		if len(shortMatches) > 0 {
 			return []byte(shortMatches[2])
 		}
 	}
 
-	if metaPartName == "metric.category" {
-		if len(longMatches) > 0 {
-			return []byte(longMatches[2])
-		}
-	}
-
 	if metaPartName == "metric.service" {
-		if len(longMatches) > 0 {
-			return []byte(longMatches[1])
-		} else if len(shortMatches) > 0 {
+		if len(shortMatches) > 0 {
 			return []byte(shortMatches[1])
 		}
 	}

pkg/tsdb/stackdriver/stackdriver_test.go

@@ -329,15 +329,15 @@ func TestStackdriver(t *testing.T) {
 
 				Convey("and the alias pattern is for metric name", func() {
 
-					query := &StackdriverQuery{AliasBy: "metric {{metric.name}} service {{metric.service}} category {{metric.category}}", GroupBys: []string{"metric.label.instance_name", "resource.label.zone"}}
+					query := &StackdriverQuery{AliasBy: "metric {{metric.name}} service {{metric.service}}", GroupBys: []string{"metric.label.instance_name", "resource.label.zone"}}
 					err = executor.parseResponse(res, data, query)
 					So(err, ShouldBeNil)
 
 					Convey("Should use alias by formatting and only show instance name", func() {
 						So(len(res.Series), ShouldEqual, 3)
-						So(res.Series[0].Name, ShouldEqual, "metric cpu/usage_time service compute category instance")
-						So(res.Series[1].Name, ShouldEqual, "metric cpu/usage_time service compute category instance")
-						So(res.Series[2].Name, ShouldEqual, "metric cpu/usage_time service compute category instance")
+						So(res.Series[0].Name, ShouldEqual, "metric instance/cpu/usage_time service compute")
+						So(res.Series[1].Name, ShouldEqual, "metric instance/cpu/usage_time service compute")
+						So(res.Series[2].Name, ShouldEqual, "metric instance/cpu/usage_time service compute")
 					})
 				})
 			})

public/app/plugins/datasource/stackdriver/partials/query.editor.html

@@ -49,8 +49,7 @@
 
   Patterns:
   <code ng-non-bindable>{{metric.type}}</code> = metric type e.g. compute.googleapis.com/instance/cpu/usage_time
-  <code ng-non-bindable>{{metric.name}}</code> = name part of metric e.g. cpu/usage_time
-  <code ng-non-bindable>{{metric.category}}</code> = category part of metric e.g. instance
+  <code ng-non-bindable>{{metric.name}}</code> = name part of metric e.g. instance/cpu/usage_time
   <code ng-non-bindable>{{metric.service}}</code> = service part of metric e.g. compute
 
   <code ng-non-bindable>{{metric.label.label_name}}</code> = Metric label metadata e.g. metric.label.instance_name