Proxy cannot send data fast enough

[gumis_148]

I have a problem with a proxy server that collects data from all hosts and passes it to zabbix server. However, it often has breaks in data collection (initially data is sent with a delay, then it does not send anything anymore). There is no error in the proxy logs. Additionally, almost all queues are over 10 minutes. I have disabled items that had the Not supported status. Where to start the analysis?


zabbix_server.conf

ListenPort=10051
LogFile=/var/log/zabbix/zabbix_server.log
LogFileSize=0
PidFile=/var/run/zabbix/zabbix_server.pid
SocketDir=/var/run/zabbix
DBName=zabbix
DBUser=zabbix_srv
DBPassword=Awg/iD6wR1id1en/8rg
StartPollers=3
StartPollersUnreachable=5
JavaGateway=127.0.0.1
StartJavaPollers=0
SNMPTrapperFile=/var/log/snmptrap/snmptrap.log
CacheSize=512M
ValueCacheSize=32M
Timeout=30
AlertScriptsPath=/usr/lib/zabbix/alertscripts
ExternalScripts=/usr/lib/zabbix/externalscripts
LogSlowQueries=3000
StatsAllowedIP=127.0.0.1

zabbix_proxy.conf

ProxyMode=0
Server=10.10.10.10
ServerPort=10051
Hostname=ZABBIX-PROXY
ListenPort=10051
LogFile=/var/log/zabbix/zabbix_proxy.log
LogFileSize=0
DebugLevel=3
PidFile=/var/run/zabbix/zabbix_proxy.pid
SocketDir=/var/run/zabbix
DBName=zabbix
DBUser=zabbix
DBPassword=ucFgIrag
ProxyOfflineBuffer=72
ConfigFrequency=600
StartPollers=20
StartPollersUnreachable=20
StartTrappers=5
StartPingers=5
SNMPTrapperFile=/var/log/snmptrap/snmptrap.log
CacheSize=128M
Timeout=25
ExternalScripts=/usr/lib/zabbix/externalscripts
LogSlowQueries=3000
StatsAllowedIP=127.0.0.1

[root@ZABBIX-PROXY ~]# ps ax | grep sender
1604511 ? S 0:00 /usr/sbin/zabbix_proxy: heartbeat sender [sending heartbeat message success in 0.077498 sec, idle 60 sec]
1604512 ? S 0:59 /usr/sbin/zabbix_proxy: data sender [sent 22 values in 0.108079 sec, idle 1 sec]
1651760 pts/0 R+ 0:00 grep --color=auto sender
[root@ZABBIX-PROXY ~]# ps ax | grep trapper
1604506 ? S 0:06 /usr/sbin/zabbix_proxy: trapper #1 [processed data in 0.041803 sec, waiting for connection]
1604507 ? S 0:04 /usr/sbin/zabbix_proxy: trapper #2 [processed data in 0.032595 sec, waiting for connection]
1604508 ? S 0:05 /usr/sbin/zabbix_proxy: trapper #3 [processed data in 0.000977 sec, waiting for connection]
1604509 ? S 0:05 /usr/sbin/zabbix_proxy: trapper #4 [processed data in 0.000226 sec, waiting for connection]
1604510 ? S 0:05 /usr/sbin/zabbix_proxy: trapper #5 [processed data in 0.000546 sec, waiting for connection]
1651787 pts/0 R+ 0:00 grep --color=auto trapper

mariadb.log

2021-01-11 8:29:10 6835 [Warning] Aborted connection 6835 to db: 'zabbix' user: 'zabbix_srv' host: 'localhost' (Got an error reading communication packets)
2021-01-11 8:29:10 6844 [Warning] Aborted connection 6844 to db: 'zabbix' user: 'zabbix_srv' host: 'localhost' (Got an error reading communication packets)
2021-01-11 8:29:10 6838 [Warning] Aborted connection 6838 to db: 'zabbix' user: 'zabbix_srv' host: 'localhost' (Got an error reading communication packets)
2021-01-11 8:29:10 6832 [Warning] Aborted connection 6832 to db: 'zabbix' user: 'zabbix_srv' host: 'localhost' (Got an error reading communication packets)