docs: public @NotNull Map<String, Integer> getStats() {
          int in = 0;
          int out = 0;
          for (Peer peer : peers.values()) {
              Map<String, Integer> connStats = peer.getStats();
              in += connStats.get("connections.in");
              out += connStats.get("connections.out");
          }
  
          Map<String, Integer> result = Maps.newHashMapWithExpectedSize(2);
          result.put("connections.in", in);
          result.put("connections.out", out);
          return result;
      }