In order to display customer data on pages cached in the full page cache (Varnish or built in), the Magento framework and Magento customer module provide a number of related tools that enable this feature. Some details are outlined in the official documentation found at http://devdocs.magento.com/guides/v2.1/config-guide/cache/cache-priv-priv.html Creating such a dynamic section on a cached page requires the use of two interfaces: * Magento\Customer\CustomerData\SectionPoolInterface * Magento\Customer\CustomerData\SectionSourceInterface The interface Magento\Customer\CustomerData\SectionPoolInterface is only referenced in the configuration file etc/frontend/di.xml, but the interface Magento\Customer\CustomerData\SectionSourceInterface has to be implemented in a custom class. These interfaces currently are not marked with the @api annotation. Please add this annotation so the feature can be used in custom modules. This actually also extends to the JavaScript "classes" Magento_Customer/js/customer-data and Magento_Ui/js/lib/core/element/element (a.k.a uiElement). Please also mark these as stable so the feature can be used as described in the documentation. Thank you!
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