Today i’ve got a strange thing: opened winbox just for checking resources & logs, and noticed this issues:

And console output:
/queue tree> pr stats
Flags: X - disabled, I - invalid
0 name="upload" parent=global-out packet-mark=upload-all limit-at=0 rate=589064 packet-rate=58
queued-bytes=3233384732 queued-packets=0 bytes=18655570893 packets=16103882 dropped=0 lends=1457339
borrows=1865579 pcq-queues=0
What is this - queued-bytes=3233384732?
resources:
/sys resource monitor
cpu-used: 21
free-memory: 12368
this value is constant, but all seems to work fine. Anyway, this is strange.