"global.tracer.lightstep.address" "meshConfig.defaultConfig.tracing.lightstep.address"
    "global.tracer.lightstep.accessToken" "meshConfig.defaultConfig.tracing.lightstep.accessToken"
    "global.tracer.zipkin.address" "meshConfig.defaultConfig.tracing.zipkin.address"
    "global.tracer.stackdriver.debug" "meshConfig.defaultConfig.tracing.stackdriver.debug"

$(TARGET_OUT):
	@mkdir -p $@

# If the hub is not explicitly set, use default to istio.
HUB ?=istio
ifeq ($(HUB),)
  $(error "HUB cannot be empty")
endif

# For dockerx builds, allow HUBS which is a space separated list of hubs. Default to HUB.
HUBS ?= $(HUB)

# If tag not explicitly set in users' .istiorc.mk or command line, default to the git sha.
TAG ?= $(shell git rev-parse --verify HEAD)
ifeq ($(TAG),)

// +structType=atomic
message SecretReference {
  // name is unique within a namespace to reference a secret resource.
  // +optional
  optional string name = 1;

  // namespace defines the space within which the secret name must be unique.
  // +optional
  optional string namespace = 2;
}

// Adapts a Secret into a volume.
//

  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#idempotency
  // +optional
  optional string generateName = 2;

  // Namespace defines the space within which each name must be unique. An empty namespace is
  // equivalent to the "default" namespace, but "default" is the canonical representation.

  // as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
  // that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
  // the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.