feat(inputs.stackdriver): allow filtering by resource metadata labels

plugins/inputs/stackdriver/README.md

@@ -79,9 +79,11 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ##
   ## The logical operators when combining filters are defined statically using
   ## the following values:
-  ##   filter ::= <resource_labels> {AND <metric_labels>}
+  ##   filter ::= <resource_labels> {AND <metric_labels> AND <user_labels> AND <system_labels>}
   ##   resource_labels ::= <resource_labels> {OR <resource_label>}
   ##   metric_labels ::= <metric_labels> {OR <metric_label>}
+  ##   user_labels ::= <user_labels> {OR <user_label>}
+  ##   system_labels ::= <system_labels> {OR <system_label>}
   ##
   ## For more details, see https://cloud.google.com/monitoring/api/v3/filters
   #
@@ -96,6 +98,18 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   #  [[inputs.stackdriver.filter.metric_labels]]
   #    key = "device_name"
   #    value = 'one_of("sda", "sdb")'
+  #
+  ## User labels refine the time series selection with the following expression:
+  ##   metadata.user_labels."<key>" = <value>
+  #  [[inputs.stackdriver.filter.user_labels]]
+  #    key = "environment"
+  #    value = 'one_of("prod", "staging")'
+  #
+  ## System labels refine the time series selection with the following expression:
+  ##   metadata.system_labels."<key>" = <value>
+  #  [[inputs.stackdriver.filter.system_labels]]
+  #    key = "machine_type"
+  #    value = 'starts_with("e2-")'
 ```
 
 ### Authentication

plugins/inputs/stackdriver/sample.conf

@@ -59,9 +59,11 @@
   ##
   ## The logical operators when combining filters are defined statically using
   ## the following values:
-  ##   filter ::= <resource_labels> {AND <metric_labels>}
+  ##   filter ::= <resource_labels> {AND <metric_labels> AND <user_labels> AND <system_labels>}
   ##   resource_labels ::= <resource_labels> {OR <resource_label>}
   ##   metric_labels ::= <metric_labels> {OR <metric_label>}
+  ##   user_labels ::= <user_labels> {OR <user_label>}
+  ##   system_labels ::= <system_labels> {OR <system_label>}
   ##
   ## For more details, see https://cloud.google.com/monitoring/api/v3/filters
   #
@@ -76,3 +78,15 @@
   #  [[inputs.stackdriver.filter.metric_labels]]
   #    key = "device_name"
   #    value = 'one_of("sda", "sdb")'
+  #
+  ## User labels refine the time series selection with the following expression:
+  ##   metadata.user_labels."<key>" = <value>
+  #  [[inputs.stackdriver.filter.user_labels]]
+  #    key = "environment"
+  #    value = 'one_of("prod", "staging")'
+  #
+  ## System labels refine the time series selection with the following expression:
+  ##   metadata.system_labels."<key>" = <value>
+  #  [[inputs.stackdriver.filter.system_labels]]
+  #    key = "machine_type"
+  #    value = 'starts_with("e2-")'

plugins/inputs/stackdriver/stackdriver.go

@@ -66,6 +66,8 @@ type (
 	ListTimeSeriesFilter struct {
 		ResourceLabels []*Label `json:"resource_labels"`
 		MetricLabels   []*Label `json:"metric_labels"`
+		UserLabels     []*Label `json:"user_labels"`
+		SystemLabels   []*Label `json:"system_labels"`
 	}
 
 	// Label contains key and value
@@ -305,6 +307,42 @@ func (s *Stackdriver) newListTimeSeriesFilter(metricType string) string {
 		}
 	}
 
+	if len(s.Filter.UserLabels) > 0 {
+		userLabelsFilter := make([]string, len(s.Filter.UserLabels))
+		for i, metricLabel := range s.Filter.UserLabels {
+			// check if metric label value contains function
+			if includeExcludeHelper(metricLabel.Value, functions, nil) {
+				valueFmt = `metadata.user_labels."%s" = %s`
+			} else {
+				valueFmt = `metadata.user_labels."%s" = "%s"`
+			}
+			userLabelsFilter[i] = fmt.Sprintf(valueFmt, metricLabel.Key, metricLabel.Value)
+		}
+		if len(userLabelsFilter) == 1 {
+			filterString += fmt.Sprintf(" AND %s", userLabelsFilter[0])
+		} else {
+			filterString += fmt.Sprintf(" AND (%s)", strings.Join(userLabelsFilter, " OR "))
+		}
+	}
+
+	if len(s.Filter.SystemLabels) > 0 {
+		systemLabelsFilter := make([]string, len(s.Filter.SystemLabels))
+		for i, metricLabel := range s.Filter.SystemLabels {
+			// check if metric label value contains function
+			if includeExcludeHelper(metricLabel.Value, functions, nil) {
+				valueFmt = `metadata.system_labels."%s" = %s`
+			} else {
+				valueFmt = `metadata.system_labels."%s" = "%s"`
+			}
+			systemLabelsFilter[i] = fmt.Sprintf(valueFmt, metricLabel.Key, metricLabel.Value)
+		}
+		if len(systemLabelsFilter) == 1 {
+			filterString += fmt.Sprintf(" AND %s", systemLabelsFilter[0])
+		} else {
+			filterString += fmt.Sprintf(" AND (%s)", strings.Join(systemLabelsFilter, " OR "))
+		}
+	}
+
 	return filterString
 }
 

plugins/inputs/stackdriver/stackdriver_test.go

@@ -1126,6 +1126,26 @@ func TestListMetricDescriptorFilter(t *testing.T) {
 							Value: `starts_with("abc-")`,
 						},
 					},
+					UserLabels: []*Label{
+						{
+							Key:   "team",
+							Value: "badgers",
+						},
+						{
+							Key:   "environment",
+							Value: `starts_with("prod-")`,
+						},
+					},
+					SystemLabels: []*Label{
+						{
+							Key:   "machine_type",
+							Value: "e2",
+						},
+						{
+							Key:   "machine_type",
+							Value: `starts_with("n2")`,
+						},
+					},
 				},
 				RateLimit: 1,
 			},
@@ -1141,7 +1161,9 @@ func TestListMetricDescriptorFilter(t *testing.T) {
 					name: "ListTimeSeries",
 					filter: `metric.type = "telegraf/cpu/usage" AND ` +
 						`(resource.labels.instance_name = "localhost" OR resource.labels.zone = starts_with("us-")) AND ` +
-						`(metric.labels.resource_type = "instance" OR metric.labels.resource_id = starts_with("abc-"))`,
+						`(metric.labels.resource_type = "instance" OR metric.labels.resource_id = starts_with("abc-")) AND ` +
+						`(metadata.user_labels."team" = "badgers" OR metadata.user_labels."environment" = starts_with("prod-")) AND ` +
+						`(metadata.system_labels."machine_type" = "e2" OR metadata.system_labels."machine_type" = starts_with("n2"))`,
 				},
 			},
 		},