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

internal/ingress/controller/config/config.go

@@ -568,6 +568,54 @@ type Configuration struct {
 	// Default: true
 	OpentracingTrustIncomingSpan bool `json:"opentracing-trust-incoming-span"`
 
+	// EnableOpentelemetry enables the nginx Opentelemetry extension
+	// By default this is disabled
+	EnableOpentelemetry bool `json:"enable-opentelemetry"`
+
+	// OpentelemetryConfig sets the opentelemetry config file
+	// Default: /etc/nginx/opentelemetry.toml
+	OpentelemetryConfig string `json:"opentelemetry-config"`
+
+	// OpentelemetryOperationName specifies a custom name for the server span
+	OpentelemetryOperationName string `json:"opentelemetry-operation-name"`
+
+	// OpentelemetryTrustIncomingSpan sets whether or not to trust incoming trace spans
+	// If false, incoming span headers will be rejected
+	// Default: true
+	OpentelemetryTrustIncomingSpan bool `json:"opentelemetry-trust-incoming-span"`
+
+	// OtlpCollectorHost specifies the host to use when uploading traces
+	OtlpCollectorHost string `json:"otlp-collector-host"`
+
+	// OtlpCollectorPort specifies the port to use when uploading traces
+	// Default: 4317
+	OtlpCollectorPort string `json:"otlp-collector-port"`
+
+	// OtelServiceName specifies the service name to use for any traces created
+	// Default: nginx
+	OtelServiceName string `json:"otel-service-name"`
+
+	// OtelSampler specifies the sampler to use for any traces created
+	// Default: AlwaysOff
+	OtelSampler string `json:"otel-sampler"`
+
+	// OtelSamplerRatio specifies the sampler ratio to use for any traces created
+	// Default: 0.01
+	OtelSamplerRatio float32 `json:"otel-sampler-ratio"`
+
+	//OtelSamplerParentBased specifies the parent based sampler to be use for any traces created
+	// Default: false
+	OtelSamplerParentBased bool `json:"otel-sampler-parent-based"`
+
+	// MaxQueueSize specifies the max queue size for uploading traces
+	OtelMaxQueueSize int32 `json:"otel-max-queuesize"`
+
+	// ScheduleDelayMillis specifies the max delay between uploading traces
+	OtelScheduleDelayMillis int32 `json:"otel-schedule-delay-millis"`
+
+	// MaxExportBatchSize specifies the max export batch size to used when uploading traces
+	OtelMaxExportBatchSize int32 `json:"otel-max-export-batch-size"`
+
 	// ZipkinCollectorHost specifies the host to use when uploading traces
 	ZipkinCollectorHost string `json:"zipkin-collector-host"`
 
@@ -917,6 +965,13 @@ func NewDefault() Configuration {
 		BindAddressIpv4:                        defBindAddress,
 		BindAddressIpv6:                        defBindAddress,
 		OpentracingTrustIncomingSpan:           true,
+		OpentelemetryTrustIncomingSpan:         true,
+		OpentelemetryConfig:                    "/etc/nginx/opentelemetry.toml",
+		OtlpCollectorPort:                      "4317",
+		OtelServiceName:                        "nginx",
+		OtelSampler:                            "AlwaysOff",
+		OtelSamplerRatio:                       0.01,
+		OtelSamplerParentBased:                 false,
 		ZipkinCollectorPort:                    9411,
 		ZipkinServiceName:                      "nginx",
 		ZipkinSampleRate:                       1.0,