/a>.</li><li><strong><em>Removed</em></strong> Security alpha API. Security beta API, which was introduced in Istio 1.5, is the only supported security API in Istio 1.6.</li></ul><h2 id=telemetry>Telemetry</h2><ul><li><strong><em>Added</em></strong> experimental support for <a href=/v1.11/docs/tasks/observability/metrics/classify-metrics/>request classification</a> filters. This enables operators to configure new attributes for use in telemetry, based on request information. A primary use case for this feat