message: Don't report metrics on severs we've not connected to yet
diff: @@ -249,6 +249,9 @@ ClientPool.prototype.totalReconnectsWaiting = function (serverDomain) {
  };
  ClientPool.prototype.updateActiveConnectionMetrics = function(server, ageCounter) {
  + if (this._virtualClients[server] === undefined) {
  + return;
  + }
  const clients = Object.values(this._virtualClients[server].userIds);
  clients.forEach((bridgedClient) => {
  if (bridgedClient.isDead()) {
  