We haven't tried to integrate Zenoss with Azkaban. I don't see why it wouldn't be able to, just need to take the effort to do it.
High availability, fail over and load balancing is currently not available in Azkaban, but we have thought of what we'll need to do to accomplish this.
The work that needs to be done would be the following:
-Integrate with state manager (zookeeper) to fail over the servers
-Add the ability to restart or continue a workflow onto another server.
We considered dual writing to a MySQL db for redundancy, but would rather have the db data replicated to a secondary that Azkaban can switch over to.
We allow users to specify the scheduled jobs in UTC as well as their current time. We are currently improving our scheduler to be more robust.
I'd say that Azkaban currently may not fit your needs for the above reasons, but we can assist in getting those features done if you decide to implement them yourself, or you can wait until we get to those features, although we would have to go through our other priorities first.
Thanks,
-Richard