/etc/mysql-mmm/mmm_common.conf is in mysql-mmm-common 2.2.1-1.1.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
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<host default>
cluster_interface eth0
pid_path /var/run/mmm_agentd.pid
bin_path /usr/lib/mysql-mmm/
replication_user replication
replication_password slave
agent_user mmm_agent
agent_password RepAgent
</host>
<host db1>
ip 192.168.0.31
mode master
peer db2
</host>
<host db2>
ip 192.168.0.32
mode master
peer db1
</host>
<host db3>
ip 192.168.0.33
mode slave
</host>
<role writer>
hosts db1, db2
ips 192.168.0.50
mode exclusive
</role>
<role reader>
hosts db1, db2, db3
ips 192.168.0.51, 192.168.0.52, 192.168.0.53
mode balanced
</role>
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