Removing a FAILED node from repmgr cluster How do I remove failed node from a PostgreSQL cluster?

postgres@db-prod-ms47ox-10-3-104-92:~$ repmgr -f /etc/repmgr/repmgr.conf cluster show
Role      | Connection String
* master  | host=db-prod-ms47ox-10-3-105-192.vandelay.io
  standby | host=db-prod-ms47ox-10-3-104-92.vandelay.io
  FAILED  | host=db-prod-lu8spc-10-3-104-145.vandelay.io


Running repmgr cluster cleanup does not remove this node and it appears to stop me from adding a new node into the cluster.

This is with repmgr 2.0 and postgres 9.1
As stated in https://groups.google.com/forum/#!topic/repmgr/R7osmnYLn4g :


  probably an UNREGISTER command is needed for that, for now... just
  delete the entry from repl_nodes 


This is done by accessing the master node with the same connection details used by repmgr and issuing the following:

DELETE FROM repmgr_&lt;cluster name&gt;.repl_nodes WHERE name = '&lt;name&gt;';