docs: protected Function<Code, Timer> asTimerFunction(final Supplier<Timer.Builder> timerTemplate) {
          final Map<Code, Timer> cache = new EnumMap<>(Code.class);
          final Function<Code, Timer> creator = code -> timerTemplate.get()
                  .tag(TAG_STATUS_CODE, code.name())
                  .register(this.registry);
          final Function<Code, Timer> cacheResolver = code -> cache.computeIfAbsent(code, creator);
          // Eager initialize
          for (final Code code : this.eagerInitializedCodes) {
              cacheResolver.apply(code);
          }
          return cacheResolver;
      }