We have a web-clustering layer that provides the distributable-web subsystem and the related infinispan web session caching resources, configured for multi-server distributed sessions.
We need a variant of this with infinispan configured for local caching.
WFLY-13099 standalone-microprofile.xml config should have this kind of setup; otherwise session sharing does not work . (A failure in org.jboss.as.test.clustering.cluster.web.shared.SharedSessionTestCase if the server uses a config without it shows this.) For WFLY-13099 I can work around this by adding the needed config stuff without a layer, but as everything else needed for those configs are from layers, it's better to use a layer in WF 20.
Besides it's a good layer to have anyway.