code: public List<HealthDependencyDto> doDependencyListing() {
      List<HealthDependencyDto> listing = Lists.newArrayList();
      for (HealthDependency dependency : healthDependencies.values()) {
        listing.add(dependencyDtoBuilder(dependency).build());
      }
      return listing;
    }
docs: Returns a list of all health dependencies, but does not check their health.