ry identity, you can also specify any conditions that define the identities. For example,
you can specify the client identity as &ldquo;user Alice calling from Bookstore frontend service”, in which case,
you have a combined identity of the calling service (<code>Bookstore frontend</code>) and the end user (<code>Alice</code>).</p><p>To improve security, you should enable <a href=/v1.21/docs/concepts/security/#authentication>authentication features</a>,
and use authenticated identities in authorization pol