[ClusterLabs] Q: crm_mon "Statck:" columns

[Techs-yama]

Hello there,

This is probably a fairly rudimentary question.
I recently started studying corosync and pacemaker.

I have a question about how to recognize heartbeat or corosync status type.
Where does the "Stack:" columns recognize for configurations when run the
crm_mon command?
[root at host1 ~]# crm_mon
============
Last updated: hoge hoge
*Stack: Heartbeat*


Is this be configured in corosync or heartbeat?
e.g.) service directive on corosync.conf?
service {
    name: pacemaker
    ver: 0
    use_mgmtd: yes
}

and then service-directive parameters are mandatory sections for
configurations?

best regards.
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