[root@zabbix-01 ~]# grep -A 3 'PGRES_FATAL_ERROR' /var/log/zabbix/zabbix_server.log
125181:20210412:090102.004 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.perf.com' and status in (5,6)]
--
125181:20210412:093202.714 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.perf.com' and status in (5,6)]
--
125183:20210412:095801.860 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.mondev.com' and status in (5,6)]
--
125181:20210412:102101.003 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.mondev.com' and status in (5,6)]
--
125182:20210412:111402.003 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.perf.com' and status in (5,6)]
--
125183:20210412:121501.006 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.mondev.com' and status in (5,6)]
--
125182:20210412:124002.948 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.perf.com' and status in (5,6)]
--
125179:20210412:124301.981 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.mondev.com' and status in (5,6)]
--
125180:20210412:124502.005 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.perf.com' and status in (5,6)]
--
125182:20210412:134901.007 [Z3005] query failed: [0] PGRES_FATAL_ERROR:server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 [select lastaccess from hosts where host='zabbix-proxy-01.mondev.com' and status in (5,6)]