code: protected <T extends Enum<T>> OperationObserver<T> createObserver(String name, Class<T> outcome, boolean canBeDisabled) {
      if(!operationStatisticsEnabled && canBeDisabled) {
        return ZeroOperationStatistic.get();
      }
      return operation(outcome).named(name).of(this).tag(getStatisticsTag()).build();
    }
docs: Create an {@code OperationObserver} using {@code this} for the context.
  
  @param name name of the statistic
  @param outcome class of the possible outcomes
  @param canBeDisabled if this statistic can be disabled by a {@link StoreStatisticsConfiguration}
  @param <T> type of the outcome
  @return the created observer