Looking at htop I see that there are a ton of processes running ffprobe -v quiet -print_format compact=print_section=0:nokey=1:escape=csv -show_entries format=duration /var/spool/asterisk/monitor/2025/03/10/<filename>
Are you storing recordings ? Ffmpeg is the recording audio converting software. It would appear you have a lot of voicemails being left or recording extensions/trunks?