Hey vSohill,
I would recommend you to delete some old logs and in case you have any Syslog to redirect them there.
Please keep monitoring this as it could be possible that the rotation of your logs stopped working. There was an issue previously in NSX-T related with the root password to be expired but as you have version 3.0 this should not be affecting you. However here is the KB that describes the issue for you to have it: VMware Knowledge Base