docs: public GetRateBasedRuleManagedKeysResult withManagedKeys(String... managedKeys) {
          if (this.managedKeys == null) {
              setManagedKeys(new java.util.ArrayList<String>(managedKeys.length));
          }
          for (String ele : managedKeys) {
              this.managedKeys.add(ele);
          }
          return this;
      }