Just did remote with Suchit and below are my notes. By the way, @SuchitSrivastav , yes, test log object CAN be created with R77 version in the host properties, though I would not do so, as version should be same or higher than gateways.
-upgraded mgmt server from R80.30 to R81.20
-so took migrate_server from R80.30 and then imported to R81.20
-when checking logs from logs and monitor, we dont see anything, but opening log files individually, we see the logs
-/var/log has 1.8 T free space
-cpwd_shows fwd process as E 1, meaning its established
-we cant find logs for any of the clusters (there are many of them) when in "logs and monitor"
-Suchit also created CP host with same IP as mgmt server
-none of 23 clusters that exist, we cant see logs just by refreshing for last 24 hours in "logs and monitor"
-will try set up one cluster with new test_log_server (same IP as mgmt), push policy and test