router

Lately my home router ASUS AX-68U with Asuswrt-Merlin firmware has been using much more CPU than it used to do. It's not being slow or anything, but I'm curious how its CPU usage jumped since I last updated the firmware. This kind of jump in CPU usage cannot be a coincidence and definitely something that I want to track down. Below is a graph from my home Zabbix dashboard.

The following is a story about partially black monitoring with many missing details due reasons told later in this post, but is also a story about how a single hint on your dashboard can sometimes be your best friend.

Last year my Raspberry Pi 4 SD card started to tell me it should be retired. Some I/O errors, and more than that, suddenly the I/O request times started to be up to 10,000-20,000 milliseconds.