[exporter/prometheusremotewrite] Fix exporter not respecting retrySet…

…tings.enabled flag (open-telemetry#27592)

**Description:** Previously the remote write exporter would incorrectly
retry if `retrySettings.enabled` was set to false.

**Testing:** Unit tests

.chloggen/prw_respectEnabledRetry.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: prometheusremotewrite
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fix remote write exporter not respecting retrySettings.enabled flag
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [27592]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: []

exporter/prometheusremotewriteexporter/exporter.go

@@ -219,8 +219,8 @@ func (prwe *prwExporter) export(ctx context.Context, requests []*prompb.WriteReq
 }
 
 func (prwe *prwExporter) execute(ctx context.Context, writeReq *prompb.WriteRequest) error {
-	// Retry function for backoff
-	retryFunc := func() error {
+	// executeFunc can be used for backoff and non backoff scenarios.
+	executeFunc := func() error {
 		// Uses proto.Marshal to convert the WriteRequest into bytes array
 		data, err := proto.Marshal(writeReq)
 		if err != nil {
@@ -264,16 +264,21 @@ func (prwe *prwExporter) execute(ctx context.Context, writeReq *prompb.WriteRequ
 		return backoff.Permanent(consumererror.NewPermanent(rerr))
 	}
 
-	// Use the BackOff instance to retry the func with exponential backoff.
-	err := backoff.Retry(retryFunc, &backoff.ExponentialBackOff{
-		InitialInterval:     prwe.retrySettings.InitialInterval,
-		RandomizationFactor: prwe.retrySettings.RandomizationFactor,
-		Multiplier:          prwe.retrySettings.Multiplier,
-		MaxInterval:         prwe.retrySettings.MaxInterval,
-		MaxElapsedTime:      prwe.retrySettings.MaxElapsedTime,
-		Stop:                backoff.Stop,
-		Clock:               backoff.SystemClock,
-	})
+	var err error
+	if prwe.retrySettings.Enabled {
+		// Use the BackOff instance to retry the func with exponential backoff.
+		err = backoff.Retry(executeFunc, &backoff.ExponentialBackOff{
+			InitialInterval:     prwe.retrySettings.InitialInterval,
+			RandomizationFactor: prwe.retrySettings.RandomizationFactor,
+			Multiplier:          prwe.retrySettings.Multiplier,
+			MaxInterval:         prwe.retrySettings.MaxInterval,
+			MaxElapsedTime:      prwe.retrySettings.MaxElapsedTime,
+			Stop:                backoff.Stop,
+			Clock:               backoff.SystemClock,
+		})
+	} else {
+		err = executeFunc()
+	}
 
 	if err != nil {
 		return consumererror.NewPermanent(err)

exporter/prometheusremotewriteexporter/exporter_test.go

@@ -345,6 +345,12 @@ func runExportPipeline(ts *prompb.TimeSeries, endpoint *url.URL) error {
 	cfg := createDefaultConfig().(*Config)
 	cfg.HTTPClientSettings.Endpoint = endpoint.String()
 	cfg.RemoteWriteQueue.NumConsumers = 1
+	cfg.RetrySettings = exporterhelper.RetrySettings{
+		Enabled:         true,
+		InitialInterval: 100 * time.Millisecond, // Shorter initial interval
+		MaxInterval:     1 * time.Second,        // Shorter max interval
+		MaxElapsedTime:  2 * time.Second,        // Shorter max elapsed time
+	}
 
 	buildInfo := component.BuildInfo{
 		Description: "OpenTelemetry Collector",
@@ -1011,6 +1017,9 @@ func TestRetryOn5xx(t *testing.T) {
 	exporter := &prwExporter{
 		endpointURL: endpointURL,
 		client:      http.DefaultClient,
+		retrySettings: exporterhelper.RetrySettings{
+			Enabled: true,
+		},
 	}
 
 	ctx := context.Background()
@@ -1041,6 +1050,9 @@ func TestNoRetryOn4xx(t *testing.T) {
 	exporter := &prwExporter{
 		endpointURL: endpointURL,
 		client:      http.DefaultClient,
+		retrySettings: exporterhelper.RetrySettings{
+			Enabled: true,
+		},
 	}
 
 	ctx := context.Background()