code: public MetadataManagerConfigurer metadataTrustedKeys(String... metadataTrustedKeys) {
          remoteDelegate.metadataTrustedKeys = Arrays.stream(metadataTrustedKeys).collect(toSet());
          return this;
      }
docs: Keys stored in the KeyManager which can be used to verify whether signature of the metadata is trusted.
  If not set any key stored in the keyManager is considered as trusted.
  <p>
  Alternatively use property:
  <pre>
  saml.sso.extended-delegate.metadata-trusted-keys
  </pre>
  </p>
  
  @param metadataTrustedKeys the names of the trusted keys.
  @return this configurer for further customization