You want to know if it is supported to monitor secondary site from HANA Cockpit, in HANA system replication environment.
Add target HANA DB to HANA Cockpit Manager.
In order to able to add HANA DB to HANA Cockpit Manager, all the 3 conditions listed in KBA 2964791 should be met.
Only when operation mode = logreplay_readaccess, all 3 conditions can be fulfilled and secondary site is able to be added to HANA Cockpit Manager.
It depends on the "operation mode".
Note, add-on license should be purchased when set operation_mode = logreplay_readaccess. See more details in KBA 1999880