Subject: How do I report bugs I encounter in v2 branch?

When I find something not working in the HEAD of the v2 branch, what is the
best way to report it?  should I mail this list, the committers list, open
a JIRA ticket, or comment on a ticket that might be involved?

Specificially, the Swagger-UI for SimpleApp is showing an empty response to
ListAll and other operations.  I am working from

Related question:  is there a collection of smoke tests for stuff like this?