We have just released rsyslog 5.5.5, a member of the devel branch. This is a bug-fixing release which contains a single fix that solves a potential hang condition on system shutdown when infinite action retries are configured for an asynchronous action using a queue in disk-assisted mode and the action was suspended. This is probably not a very common case, but a configuration recommended by our doc samples. If you do not use such a configuration, there is no need to update at this time. See Changelog for more details.
As always, feedback is appreciated.