It should be 
 system_u:object_r:glusterd_brick_t:s0

Best Regards,
Strahil Nikolov
I'm having this same issue on 4.4.8 with a fresh 3-node install as well.

Same errors as the OP. 

Potentially relevant test command:

[root@ovirt-node0 ~]# semanage fcontext -a -t glusterd_brick_t "/gluster_bricks(/.*)?"
ValueError: Type glusterd_brick_t is invalid, must be a file or device type

Seems like the glusterd selinux fcontexts are missing.  Are they provided by glusterd_selinux?

[root@ovirt-node0 ~]# dnf install selinux-policy
Last metadata expiration check: 0:03:51 ago on Wed 15 Sep 2021 11:31:59 AM UTC.
Package selinux-policy-3.14.3-79.el8.noarch is already installed.

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