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/wait-for-nginx.sh

@@ -23,6 +23,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 export NAMESPACE=$1
 export NAMESPACE_OVERLAY=$2
+export IS_CHROOT=$3
 
 echo "deploying NGINX Ingress controller in namespace $NAMESPACE"
 
@@ -46,6 +47,16 @@ metadata:
 
 EOF
 
+OTEL_MODULE=$(cat <<EOF
+  opentelemetry:
+    enabled: true
+EOF
+)
+
+if [[ "$NAMESPACE_OVERLAY" != "enable-opentelemetry" ]]; then
+  OTEL_MODULE=""
+fi
+
 # Use the namespace overlay if it was requested
 if [[ ! -z "$NAMESPACE_OVERLAY" && -d "$DIR/namespace-overlays/$NAMESPACE_OVERLAY" ]]; then
     echo "Namespace overlay $NAMESPACE_OVERLAY is being used for namespace $NAMESPACE"
@@ -59,7 +70,7 @@ fullnameOverride: nginx-ingress
 controller:
   image:
     repository: ingress-controller/controller
-    chroot: true
+    chroot: ${IS_CHROOT}
     tag: 1.0.0-dev
     digest:
     digestChroot:
@@ -100,6 +111,8 @@ controller:
       hostPath:
         path: /tmp/coredump
 
+${OTEL_MODULE}
+
 rbac:
   create: true
   scope: true