[Experimental] Routing based on derived <a href=/v1.18/latest/docs/reference/config/security/conditions/>metadata</a>
is now supported. A prefix &lsquo;@&rsquo; is used to denote a match against internal metadata instead of the headers in the request.
Currently this feature is only supported for the following metadata:</p><ul><li><code>request.auth.claims.{claim-name}[.{sub-claim}]*</code> which are extracted from validated JWT tokens. The claim name
currently does not support the <code>.</code> character. 