signpost_notificationd is flooding error log with błąd "0 is not a valid connection ID"
MacBookPro 2017 / MacBookPro14,3

I was getting this issue on reboot along with the high kernal_task usage. I went through the console killing of the noisiest processes and sure enough, signpost was one of them. Soon as I did, my kernal_task process dropped back to normal. It has been running at > 600%.

sudo ps aux | grep -E '^root.*signpost_notificationd' | awk '{system("sudo kill -9 " $2)}'