&gt; * clustering - what kinds of clusters are supported? How do they scale? Do they favor availability or consistency?<p>There is no persistence so consistency is irrelevant. NATS does everything in the name of availability to the point of dropping connections for slow consumers.<p>&gt; * security - is there any authentication? authorization for certain resources? TLS?<p>TLS is planned, not sure on timeline. It sounds like Apcera has plans for some form of authentication and multitenancy as well.<p>&gt; * guarantuees for delivery? Transactional modes?<p>At-most-once delivery. No transactions. There may be some form of more reliable delivery coming in the future, but I&#x27;m not sure of the details.<p>&gt; * what does the wire protocol look like? Support for meta data?<p>Very simple text-based protocol. I don&#x27;t think it&#x27;s formally documented anywhere currently though.