add simple gce setup for apiserver tracing

Author: dashpole

cluster/gce/gci/configure-helper.sh

@@ -995,6 +995,14 @@ users:
 EOF
   fi
 
+  if [[ "${ENABLE_APISERVER_TRACING:-false}" == "true" ]]; then
+    cat <<EOF >/etc/srv/kubernetes/opentelemetry_config.yaml
+apiVersion: apiserver.k8s.io/v1alpha1
+kind: OpenTelemetryClientConfiguration
+url: localhost:55680
+EOF
+  fi
+
   if [[ -n "${ADMISSION_CONTROL:-}" ]]; then
     # Emit a basic admission control configuration file, with no plugins specified.
     cat <<EOF >/etc/srv/kubernetes/admission_controller_config.yaml

cluster/gce/gci/configure-kubeapiserver.sh

@@ -255,6 +255,10 @@ function start-kube-apiserver {
     params+=" --admission-control-config-file=/etc/srv/kubernetes/admission_controller_config.yaml"
   fi
 
+  if [[ "${ENABLE_APISERVER_TRACING:-false}" == "true" ]]; then
+    params+=" --opentelemetry-config-file=/etc/srv/kubernetes/opentelemetry_config.yaml"
+  fi
+
   # If GKE exec auth support is requested for webhooks, then
   # gke-exec-auth-plugin needs to be mounted into the kube-apiserver container.
   local webhook_exec_auth_plugin_mount=""