I haven't used cros_workon_make in a while so I didn't notice this.

File specified in CROS_WORKON_SUBTREE is missing: /build/caroline/tmp/portage/chromeos-base/memd-9999/work/memd-9999/metrics/memd

S: /build/caroline/tmp/portage/chromeos-base/memd-9999/work/memd-9999
keep_dirs: /build/caroline/tmp/portage/chromeos-base/memd-9999/work/memd-9999/metrics/memd

Maybe this should be fixed by moving memd to platform2 and denying use of subdirectories of platform2/*.