During our High Availability/Fault tollerance DB discovery we have found and tested TiDB (https://github.com/pingcap/tidb), a "NewSQL" scalable/distributed/fault-tolerant Relational DB near 100% compatible with MySQL Client.
In our test, we have used Zabbix 4.0 without a special tuning and unmodified default Zabbix Schema used on MySQL. The test seems very promising with near 2k NVPS on a set of virtual machine.
Could we share our consideration with the Zabbix Team?