bool CustomStatNamespacesImpl::registered(const absl::string_view name) const {

  ASSERT_IS_MAIN_OR_TEST_THREAD();

  return namespaces_.find(name) != namespaces_.end();

}

void CustomStatNamespacesImpl::registerStatNamespace(const absl::string_view name) {

  ASSERT_IS_MAIN_OR_TEST_THREAD();

  namespaces_.insert(std::string(name));

};

CustomStatNamespacesImpl::stripRegisteredPrefix(const absl::string_view stat_name) const {

  ASSERT_IS_MAIN_OR_TEST_THREAD();

  if (!namespaces_.empty()) {

    const auto pos = stat_name.find_first_of('.');

    if (pos != std::string::npos && registered(stat_name.substr(0, pos))) {

      return stat_name.substr(pos + 1);

    }

  }

  return absl::nullopt;

};