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1.17.3</span><ul class=footer-base-releases><li class=footer-base-releases-item><a tabindex=-1 class=footer-base-releases-link onclick='return navigateToUrlOrRoot("https://istio.io/docs/reference/config/proxy_extensions/metadata_exchange/"),!1'>current release</a></li><li class=footer-base-releases-item><a tabindex=-1 class=footer-base-releases-link onclick='return navigateToUrlOrRoot("https://preliminary.istio.io/docs/reference/config/proxy_extensions/metadata_exchange/"),!1'>next release</a