Comment 3 for bug 1839683

This may be an issue with documentation or other; it's not clear whether the configuration options of the charm were changed so that the rabbitmq-server expected the to reduce the cluster size below the minimum (min-cluster-size?). Rabbitmq also doesn't really 'like' even cluster sizes -- it's not clear but it seemed to be '6'. Also for rabbitmq reasonable cluster sizes are 3.

Having said that, there was a hook-error, and charms should not error out; they should report the failure in the log and status line as appropriate.