docs: public List<String> getDispatcherKeysForProperty(String propertyKey, @Nullable String propertyValue) {
      ImmutableList.Builder<String> keys = ImmutableList.builder();
      for (NotificationDispatcherMetadata metadata : dispatchersMetadata) {
        String dispatcherKey = metadata.getDispatcherKey();
        String value = metadata.getProperty(propertyKey);
        if (value != null && (propertyValue == null || value.equals(propertyValue))) {
          keys.add(dispatcherKey);
        }
      }
      return keys.build();
    }