You can retrieve the logs with the oc logs [-f] <pod_name> command, where the -f is optional. Specify the name of a log collector pod. Use the -f option to follow what is being written into the logs. The contents of log files are printed out.
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.2/html/logging/cluster-logging-viewing#:~:text=You%20can%20retrieve%20the%20logs,where%20the%20%2Df%20is%20optional.&text=1-,Specify%20the%20name%20of%20a%20log%20collector%20pod.,being%20written%20into%20the%20logs.&text=The%20contents%20of%20log%20files%20are%20printed%20out.