Zabbix Proxy sends data at higher rate than configured with DataSenderFrequency

[bajo]

Hi,

I'm testing an active Zabbix proxy of different versions 5.4 and 5.5 (not at the same time of course).
I changed the DataSenderFrequency from 1 to 30, which according to documentation should only upload data from the proxy to the server every 30 seconds.
Looking at the processes however, I often see the following

/usr/sbin/zabbix_proxy: data sender [sent 0 values in 1.003607 sec, sending data]
/usr/sbin/zabbix_proxy: data sender [sent 0 values in 1.318640 sec, idle 1 sec]

I'm trying to reduce the number of connections between the proxy and the server as Internet is only provided by a LTE connection with a limited data cap.

I also checked the configured templates and items for the single host observed by this proxy, and I can't find any items that should be updated once per second. So, I'm a little bit confused as to who and why the data_sender tries to send any values at a 1 second interval and why does it even open a connection to the server (TLS encrypted with a certificate) when it often has 0 values to upload?
The TLS connections to the server are quite obvious looking at wireshark.

Any ideas are greatly appreciated.
Thanks,
Bajo

[bajo]

Thank you cyber . Seems I did not read this too carefully. In the meantime I found https://support.zabbix.com/browse/ZBXNEXT-4998 and build the proxy locally with an increased interval to better fit my need.
As other people seem interested as well I might open a PR to make this configurable instead.

[cyber]

https://www.zabbix.com/documentation/current/manual/appendix/config/zabbix_proxy

DataSenderFrequency

no

1-3600

1

Proxy will send collected data to the server every N seconds. Note that active proxy will still poll Zabbix server every second for remote command tasks.