Steps to reproduce:

1. deploy Galera cluster on 3 nodes (Master-Master)
2. run Zabbix Proxy as a container with the DB server as one of the nodes (or it can be a virtual IP using haproxy) 
3. check data sender process : ps -ef | grep "data sender"

Result:

**

when increasing debug level to 5, the  following logs are repeated: 

221:20211104:131507.233 proxy_get_history_data() 2 record(s) missing. Waiting 0.100000 sec, retrying.

the function that fails is proxy_get_history_data. 

due to this, the Proxy fails to send data fast enough. so the data will be stuck in the queue for hours or even days 

Expected:
to have data sent in mili seconds. 

data sender process not 100% busy