Critical Steps to reproduce:
We updated from 3.4.3 to 3.4.5 (13.01. 00:45) and got serious performance issues.
Result:
See history syncer usage in 
We have delays in graphs up to 15 minutes after HH:00 and with the history syncer processes on 100%, so perhaps it has something to do with the trends. See 
Expected:
Like before 13.01. 00:45, nearly no history syncer usage, just some peaks still below 50%.
![zabbix_ Custom graphs [refreshed every 30 sec.] - Mozilla Firefox 2018-01-17 14.55.37.png](/secure/attachment/57230/zabbix_%20Custom%20graphs%20%5Brefreshed%20every%2030%20sec.%5D%20-%20Mozilla%20Firefox%202018-01-17%2014.55.37.png)
![zabbix_ Custom graphs [refreshed every 30 sec.] - Mozilla Firefox 2018-01-18 09.53.44.png](/secure/attachment/57275/zabbix_%20Custom%20graphs%20%5Brefreshed%20every%2030%20sec.%5D%20-%20Mozilla%20Firefox%202018-01-18%2009.53.44.png)
- caused by
-
ZBXNEXT-4002 Implement REST API history service calls in server (PoC for Elastic)
-
- Closed
-
- is duplicated by
-
ZBX-13341 history syncer slowdown
-
- Closed
-
