High process usage in the night (softirq)

[kindacute]

Something strange happens in the night with cpu load:

I am pretty sure that no one used it in this time. Any ideas what was it? Maybe any ideas of how to debug it next night?
log say nothing during this time:

Tue Jan 10 06:36:23 2023 daemon.notice netifd: wan (5203): udhcpc: sending renew to server 10.255.254.229
Tue Jan 10 06:36:23 2023 daemon.notice netifd: wan (5203): udhcpc: lease of 10.4.107.16 obtained from 10.255.254.229, lease time 600
Tue Jan 10 06:36:27 2023 daemon.err odhcpd[4406]: Failed to send to ff02::1%lan@br-lan (Network unreachable)
Tue Jan 10 06:36:43 2023 daemon.err odhcpd[4406]: Failed to send to ff02::1%lan@br-lan (Network unreachable)
Tue Jan 10 06:36:59 2023 daemon.err odhcpd[4406]: Failed to send to ff02::1%lan@br-lan (Network unreachable)

[kindacute]

Hm. looks like I have an answer:

Now need to understand what device was downloading something during this period.

[d687r02j8g]

What package are you using for these graphs?

[slh]

luci-statistics/ collectd with rrd.

[moeller0]

@kindacute

Now need to understand what device was downloading something during this period.

I think windows defaults to doing automatic updates outside of normal usage times, which could well be, in the middle of the night....

[kindacute]

Thank you for hints