starting logging v6.4 we support using s3 as an output for logging but we do not have the table update for s3 output on which compression type does s3 support 

doc link 

https://docs.redhat.com/en/documentation/red_hat_openshift_logging/6.4/html/configuring_logging/configuring-log-forwarding#forwarding-logs-to-amazon-s3-endpoint_configuring-log-forwarding:~:text=Table%C2%A01.1.%C2%A0Supported%20compression%20types%20for%20tuning%20outputs