heroku logs --tail --app APP | grep -E 'service=.*' -o

output

service=3582ms status=200 bytes=9382
service=21ms status=200 bytes=23255
service=54ms status=200 bytes=13291
service=69ms status=200 bytes=15963
service=9ms status=200 bytes=28628
service=134ms status=200 bytes=3690
service=1063ms status=200 bytes=2280
service=59ms status=200 bytes=2578
service=68ms status=200 bytes=2580
service=174ms status=200 bytes=2273