apk add htop

apk add htop
(1/3) Installing ncurses-terminfo-base (6.3_p20220521-r0)
(2/3) Installing ncurses-libs (6.3_p20220521-r0)
(3/3) Installing htop (3.2.0-r1) 
Executing busybox-1.35.0-r13.trigger 
OK: 6 MiB in 17 packages

See also

• apk, [ add | list | upgrade | info | search ] apk --help