message: Add missing slash before distribution metrics.
diff: @@ -2359,9 +2359,9 @@ def create_mirrored_variable( # pylint: disable=missing-docstring
  # ------------------------------------------------------------------------------
  # Metrics to track which distribution strategy is being called
  distribution_strategy_gauge = monitoring.StringGauge(
  - "tensorflow/api/distribution_strategy",
  + "/tensorflow/api/distribution_strategy",
  "Gauge to track the type of distribution strategy used.", "TFVersion")
  distribution_strategy_replica_gauge = monitoring.IntGauge(
  - "tensorflow/api/distribution_strategy/replica",
  + "/tensorflow/api/distribution_strategy/replica",
  "Gauge to track the number of replica each distribution strategy used.",
  "CountType")
  