pmm-managed not started after whole server restart

Prometheus start took just 14 seconds:
time="2017-10-30T09:57:00Z" level=info msg="Starting prometheus (version=1.7.2, branch=v1.7.2, revision=22eadbe635528fa17b99a7635fed6b6018103042)" source="main.go:88"
time="2017-10-30T09:57:10Z" level=info msg="Scanning files." source="crashrecovery.go:55"
time="2017-10-30T09:57:10Z" level=info msg="10000 files scanned." source="crashrecovery.go:77"
time="2017-10-30T09:57:14Z" level=info msg="Listening on :9090" source="web.go:259"

But it's not fast enough for current pmm-managed timeouts in supervisord:
first time started:
time="2017-10-30T09:56:58Z" level=info msg="Starting server on http://127.0.0.1:7771/ ..." component=gRPC

time="2017-10-30T09:55:59Z" level=warning msg="Received SIGTERM, exiting gracefully..." source="main.go:234"

Stopped by supervised:
2017-10-30 09:57:06,328 INFO gave up: pmm-managed entered FATAL state, too many start retries too quickly

Original error visible with pmm-admin list:
Error getting a list of external metrics: status code 502 (text/html).
Please check versions of your PMM Server and PMM Client.

Fixed by:
docker exec -it pmm-server supervisorctl start pmm-managed

Expected behaviour:

• wait more for prometheus
• or have longer timeout in supervisord