bservability/metrics/customize-metrics/>Prometheus metrics customization</a>.</li><li>Global and Local Rate-Limiting (<code>memquota</code> and <code>redisquota</code> adapters) functionality is provided through the <a href=/v1.16/docs/tasks/policy-enforcement/rate-limit/>Envoy-based rate-limiting solution</a>.</li><li><code>OPA</code> adapter is replaced by the <a href=/v1.16/docs/tasks/security/authorization/authz-custom/>Envoy ext-authz based solution</a>, which supports <a href=https://www.openpolicyage