feat: OpenTelemetry module integration (#9062)

* OpenTelemetry module integration

* e2e test

* e2e test fix

* default OpentelemetryConfig

* e2e values

* mount otel module for otel test only

* propagate IS_CHROOT

* propagate IS_CHROOT e2e test

* code doc

* comments

* golint

* opentelemetry doc

* zipkin

* zipkin

* typo

* update e2e test OpenTelemetry value

* use opentelemetry value

* revert merge conflict

* fix

* format

* review comments

* clean

test/e2e/settings/opentelemetry.go

@@ -0,0 +1,119 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package settings
+
+import (
+	"strings"
+
+	"github.com/onsi/ginkgo/v2"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+const (
+	enableOpentelemetry            = "enable-opentelemetry"
+	opentelemetryTrustIncomingSpan = "opentelemetry-trust-incoming-span"
+
+	opentelemetryOperationName         = "opentelemetry-operation-name"
+	opentelemetryLocationOperationName = "opentelemetry-location-operation-name"
+	opentelemetryConfig                = "opentelemetry-config"
+	opentelemetryConfigPath            = "/etc/nginx/opentelemetry.toml"
+)
+
+var _ = framework.IngressNginxDescribe("Configure Opentelemetry", func() {
+	f := framework.NewDefaultFramework("enable-opentelemetry")
+
+	ginkgo.BeforeEach(func() {
+		f.NewEchoDeployment()
+	})
+
+	ginkgo.AfterEach(func() {
+	})
+
+	ginkgo.It("should not exists opentelemetry directive", func() {
+		config := map[string]string{}
+		config[enableOpentelemetry] = "false"
+		f.SetNginxConfigMapData(config)
+
+		f.EnsureIngress(framework.NewSingleIngress(enableOpentelemetry, "/", enableOpentelemetry, f.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return !strings.Contains(cfg, "opentelemetry on")
+			})
+	})
+
+	ginkgo.It("should exists opentelemetry directive when is enabled", func() {
+		config := map[string]string{}
+		config[enableOpentelemetry] = "true"
+		config[opentelemetryConfig] = opentelemetryConfigPath
+		f.SetNginxConfigMapData(config)
+
+		f.EnsureIngress(framework.NewSingleIngress(enableOpentelemetry, "/", enableOpentelemetry, f.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, "opentelemetry on")
+			})
+	})
+
+	ginkgo.It("should include opentelemetry_trust_incoming_spans on directive when enabled", func() {
+		config := map[string]string{}
+		config[enableOpentelemetry] = "true"
+		config[opentelemetryConfig] = opentelemetryConfigPath
+		config[opentelemetryTrustIncomingSpan] = "true"
+		f.SetNginxConfigMapData(config)
+
+		f.EnsureIngress(framework.NewSingleIngress(enableOpentelemetry, "/", enableOpentelemetry, f.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, "opentelemetry_trust_incoming_spans on")
+			})
+	})
+
+	ginkgo.It("should not exists opentelemetry_operation_name directive when is empty", func() {
+		config := map[string]string{}
+		config[enableOpentelemetry] = "true"
+		config[opentelemetryConfig] = opentelemetryConfigPath
+		config[opentelemetryOperationName] = ""
+		f.SetNginxConfigMapData(config)
+
+		f.EnsureIngress(framework.NewSingleIngress(enableOpentelemetry, "/", enableOpentelemetry, f.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return !strings.Contains(cfg, "opentelemetry_operation_name")
+			})
+	})
+
+	ginkgo.It("should exists opentelemetry_operation_name directive when is configured", func() {
+		config := map[string]string{}
+		config[enableOpentelemetry] = "true"
+		config[opentelemetryConfig] = opentelemetryConfigPath
+		config[opentelemetryOperationName] = "HTTP $request_method $uri"
+		f.SetNginxConfigMapData(config)
+
+		f.EnsureIngress(framework.NewSingleIngress(enableOpentelemetry, "/", enableOpentelemetry, f.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, `opentelemetry_operation_name "HTTP $request_method $uri"`)
+			})
+	})
+
+})