[exporter/prometheusremotewrite] deprecate export_created_metric

.chloggen/35003-deprecate-export_created_metric.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: deprecation
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporter/prometheusremotewrite
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: deprecate export_created metric
+
+# One or more tracking issues or pull requests related to the change
+issues: [35003]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/prometheusremotewriteexporter/config.go

@@ -45,6 +45,7 @@ type Config struct {
 	TargetInfo *TargetInfo `mapstructure:"target_info,omitempty"`
 
 	// CreatedMetric allows customizing creation of _created metrics
+	// Deprecated: This feature is useless in PRWv1 and and PRWv2 already have the created timestamp in the proto
 	CreatedMetric *CreatedMetric `mapstructure:"export_created_metric,omitempty"`
 
 	// AddMetricSuffixes controls whether unit and type suffixes are added to metrics on export

exporter/prometheusremotewriteexporter/exporter.go

@@ -128,6 +128,10 @@ func newPRWExporter(cfg *Config, set exporter.Settings) (*prwExporter, error) {
 		batchTimeSeriesState: newBatchTimeSericesState(),
 	}
 
+	if prwe.exporterSettings.ExportCreatedMetric {
+		prwe.settings.Logger.Warn("export_created_metric is deprecated and will be removed in a future release")
+	}
+
 	prwe.wal = newWAL(cfg.WAL, prwe.export)
 	return prwe, nil
 }