feat(outputs.stackdriver): Ensure quota is charged to configured project (#16583)

Co-authored-by: root <root@lpce28af8.homedepot.com>

plugins/outputs/stackdriver/README.md

@@ -36,6 +36,13 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ## GCP Project
   project = "erudite-bloom-151019"
 
+  ## Quota Project
+  ## Specifies the Google Cloud project that should be billed for metric ingestion.
+  ## If omitted, the quota is charged to the service account’s default project.
+  ## This is useful when sending metrics to multiple projects using a single service account.
+  ## The caller must have the `serviceusage.services.use` permission on the specified project.
+  # quota_project = ""
+
   ## The namespace for the metric descriptor
   ## This is optional and users are encouraged to set the namespace as a
   ## resource label instead. If omitted it is not included in the metric name.

plugins/outputs/stackdriver/sample.conf

@@ -3,6 +3,13 @@
   ## GCP Project
   project = "erudite-bloom-151019"
 
+  ## Quota Project
+  ## Specifies the Google Cloud project that should be billed for metric ingestion.
+  ## If omitted, the quota is charged to the service account’s default project.
+  ## This is useful when sending metrics to multiple projects using a single service account.
+  ## The caller must have the `serviceusage.services.use` permission on the specified project.
+  # quota_project = ""
+
   ## The namespace for the metric descriptor
   ## This is optional and users are encouraged to set the namespace as a
   ## resource label instead. If omitted it is not included in the metric name.

plugins/outputs/stackdriver/stackdriver.go

@@ -33,6 +33,7 @@ var sampleConfig string
 // Stackdriver is the Google Stackdriver config info.
 type Stackdriver struct {
 	Project              string            `toml:"project"`
+	QuotaProject         string            `toml:"quota_project"`
 	Namespace            string            `toml:"namespace"`
 	ResourceType         string            `toml:"resource_type"`
 	ResourceLabels       map[string]string `toml:"resource_labels"`
@@ -136,9 +137,19 @@ func (s *Stackdriver) Connect() error {
 
 	s.ResourceLabels["project_id"] = s.Project
 
+	// Define client options, starting with the user agent
+	options := []option.ClientOption{
+		option.WithUserAgent(internal.ProductToken()),
+	}
+
+	if s.QuotaProject != "" {
+		options = append(options, option.WithQuotaProject(s.QuotaProject))
+		s.Log.Infof("Using QuotaProject %s for quota attribution", s.QuotaProject)
+	}
+
 	if s.client == nil {
 		ctx := context.Background()
-		client, err := monitoring.NewMetricClient(ctx, option.WithUserAgent(internal.ProductToken()))
+		client, err := monitoring.NewMetricClient(ctx, options...)
 		if err != nil {
 			return err
 		}