Docs. No description of heat-engine in reference-architecture.html#multi-node-with-ha-deployment

http://docs.mirantis.com/openstack/fuel/fuel-6.0/reference-architecture.html#multi-node-with-ha-deployment

There are no description about heat-engine

 Clone Set: clone_p_heat-engine [p_heat-engine]
     Started: [ node-26 node-27 node-28 ]

 Clone Set: clone_p_heat-engine [p_heat-engine]
     Started: [ node-31 ]

but it is present into pacemacker in clean (ha, 1 controller node, 1 compute node)

root@node-31:~# pcs status
Cluster name:
Last updated: Thu Feb 12 11:54:28 2015
Last change: Thu Feb 12 11:43:55 2015 via cibadmin on node-31
Stack: classic openais (with plugin)
Current DC: node-31 - partition WITHOUT quorum
Version: 1.1.10-42f2063
1 Nodes configured, 2 expected votes
11 Resources configured

Online: [ node-31 ]

Full list of resources:

 vip__public (ocf::mirantis:ns_IPaddr2): Started node-31
 Clone Set: clone_ping_vip__public [ping_vip__public]
     Started: [ node-31 ]
 vip__management (ocf::mirantis:ns_IPaddr2): Started node-31
 Clone Set: clone_p_heat-engine [p_heat-engine]
     Started: [ node-31 ]
 Master/Slave Set: master_p_rabbitmq-server [p_rabbitmq-server]
     Masters: [ node-31 ]
 Clone Set: clone_p_neutron-plugin-openvswitch-agent [p_neutron-plugin-openvswitch-agent]
     Started: [ node-31 ]
 p_neutron-dhcp-agent (ocf::mirantis:neutron-agent-dhcp): Started node-31
 Clone Set: clone_p_neutron-metadata-agent [p_neutron-metadata-agent]
     Started: [ node-31 ]
 Clone Set: clone_p_neutron-l3-agent [p_neutron-l3-agent]
     Started: [ node-31 ]
 Clone Set: clone_p_mysql [p_mysql]
     Started: [ node-31 ]
 Clone Set: clone_p_haproxy [p_haproxy]
     Started: [ node-31 ]

Also
http://docs.mirantis.com/openstack/fuel/fuel-6.0/reference-architecture.html#pacemaker-settings

Pacemaker is the cluster resource manager used by Fuel to manage Neutron resources, HAProxy, virtual IP addresses and MySQL Galera cluster.

Thereis no heat-engine too.