docs: function getKeyspace() {
    var o = {}
      , i
      , db
      , size;
    for(i in this.state.store.databases) {
      db = this.state.store.databases[i];
      size = db.dbsize();
      if(size) {
        o['db' + i] = util.format('keys=%s,expires=%s', size, db.expiring);
      }
    }
    return o;
  }