[OTEL-2125] Add E2E test for no dd exporter case

comp/otelcol/ddflareextension/impl/server.go

@@ -112,7 +112,9 @@ func newServer(endpoint string, handler http.Handler) (*server, error) {
 	r := mux.NewRouter()
 	r.Handle("/", handler)
 
-	r.Use(validateToken)
+	if util.GetAuthToken() != "" {
+		r.Use(validateToken)
+	}
 
 	s := &http.Server{
 		Addr:      endpoint,

test/new-e2e/tests/otel/otel-agent/config/no-dd-exporter.yml

@@ -0,0 +1,23 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
+
+exporters:
+  debug:
+    verbosity: detailed
+
+service:
+  pipelines:
+    metrics:
+      receivers: [otlp]
+      exporters: [debug]
+    traces:
+      receivers: [otlp]
+      exporters: [debug]
+    logs:
+      receivers: [otlp]
+      exporters: [debug]

test/new-e2e/tests/otel/otel-agent/no_dd_exporter_test.go

@@ -0,0 +1,62 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2016-present Datadog, Inc.
+
+// Package otelagent contains e2e otel agent tests
+package otelagent
+
+import (
+	_ "embed"
+	"testing"
+
+	"github.com/DataDog/test-infra-definitions/components/datadog/kubernetesagentparams"
+
+	"github.com/DataDog/datadog-agent/test/new-e2e/pkg/e2e"
+	"github.com/DataDog/datadog-agent/test/new-e2e/pkg/environments"
+	awskubernetes "github.com/DataDog/datadog-agent/test/new-e2e/pkg/environments/aws/kubernetes"
+	"github.com/DataDog/datadog-agent/test/new-e2e/tests/otel/utils"
+)
+
+type noDDExporterTestSuite struct {
+	e2e.BaseSuite[environments.Kubernetes]
+}
+
+//go:embed config/no-dd-exporter.yml
+var noDDExporterConfig string
+
+func TestOTelAgentWithNoDDExporter(t *testing.T) {
+	values := `
+datadog:
+  logs:
+    containerCollectAll: false
+    containerCollectUsingFiles: false
+`
+	t.Parallel()
+	e2e.Run(t, &noDDExporterTestSuite{},
+		e2e.WithProvisioner(
+			awskubernetes.KindProvisioner(
+				awskubernetes.WithAgentOptions(
+					kubernetesagentparams.WithoutDualShipping(),
+					kubernetesagentparams.WithHelmValues(values),
+					kubernetesagentparams.WithOTelAgent(),
+					kubernetesagentparams.WithOTelConfig(noDDExporterConfig),
+				))))
+}
+
+func (s *noDDExporterTestSuite) TestOTelAgentInstalled() {
+	utils.TestOTelAgentInstalled(s)
+}
+
+func (s *noDDExporterTestSuite) TestFlare() {
+	expectedContents := []string{
+		"otel-agent",
+		"ddflare/dd-autoconfigured:",
+		"health_check/dd-autoconfigured:",
+		"pprof/dd-autoconfigured:",
+		"zpages/dd-autoconfigured:",
+		"infraattributes/dd-autoconfigured:",
+		"prometheus/dd-autoconfigured:",
+	}
+	utils.TestOTelFlare(s, expectedContents)
+}