Hi,
First off, that is not an official service:
root@gitlab:~# ps aux | grep -i redis
gitlab-+ 12353 1.8 0.0 75996 19724 ? Ssl Nov03 509:49 /opt/gitlab/embedded/bin/redis-server 127.0.0.1:0
root 24006 0.0 0.0 8740 824 pts/0 S+ 15:47 0:00 grep -i redis
redis 26370 0.2 0.0 94152 12664 ? Ssl Nov08 50:16 /usr/bin/redis-server 127.0.0.1:6379
root 28826 0.0 0.0 2160 700 ? Ss Nov02 0:00 runsv redis
root 28840 0.0 0.0 2304 1224 ? S Nov02 0:01 svlogd -tt /var/log/gitlab/redis
that is from my server. Most likely that is a cryptominer since no gitlab processes run as git. That means your gitlab install has been compromised and you need to upgrade it so that the vulnerabilities are fixed. For more info read this post: