Follow this?
https://github.com/luci/luci-py/blob/master/appengine/config_service/README.md

no, that doc is for setting luci-config itself.

I think in your case, you may follow how luci-migration app is using luci-config:

https://cs.chromium.org/chromium/infra/go/src/infra/appengine/luci-migration/config/?sq=package:chromium&dr=CSs&g=0

Blocking staging setup.

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infradata/config/+/20b22c4f546931d25e78cde2f8d4e3658f92dc6c

commit 20b22c4f546931d25e78cde2f8d4e3658f92dc6c
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Wed Jul 25 19:09:27 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/70f33fb4da6da086d08e497637f84f43c3514c76

commit 70f33fb4da6da086d08e497637f84f43c3514c76
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Tue Jul 31 19:13:18 2018

crosskylabadmin: Use luci-config to load service configuration

Loaded configuration is not yet used for anything.

BUG= chromium:855799 

Change-Id: I0c17525beda27c902d1f70f289b4d24d4160c0ff
Reviewed-on: https://chromium-review.googlesource.com/1149323
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Ryan Tseng <hinoka@chromium.org>

[add] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/config/config.proto
[add] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/config/gen.go
[add] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/config/config.infra_testing
[add] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/config/config.go
[add] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/config/config.pb.go
[modify] https://crrev.com/70f33fb4da6da086d08e497637f84f43c3514c76/go/src/infra/appengine/crosskylabadmin/app/handlers.go

Must setup luci-config to recognize each service following https://cs.chromium.org/chromium/infra/luci/appengine/config_service/doc/README.md

Also, must setup cron jobs on the tenant service following https://godoc.org/github.com/luci/luci-go/appengine/gaemiddleware#hdr-Cron_setup

Better link for first doc: https://chromium.googlesource.com/infra/luci/luci-py/+/master/appengine/config_service/doc/

protip: Head over to https://chromeos-skylab-bot-fleet.appspot.com/admin/portal  to setup various chops service configuration that lives with the tenant service.

It has the best documentation for what is needed for luci-config as well.

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infradata/config/+/c83e3d79afe59f72db525f388be0d519d0746d5d

commit c83e3d79afe59f72db525f388be0d519d0746d5d
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Wed Aug 01 19:46:40 2018

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infradata/config/+/74620687bb975167e594bd10e9b0b9a3ffa6ecbe

commit 74620687bb975167e594bd10e9b0b9a3ffa6ecbe
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 00:47:57 2018

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infradata/config/+/d09c5ef97340d95252fc45871bb0c9b99b9dba95

commit d09c5ef97340d95252fc45871bb0c9b99b9dba95
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 18:19:41 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/1dbd18ba1a7eb6b347c7c0e6d9617840ac9fc02b

commit 1dbd18ba1a7eb6b347c7c0e6d9617840ac9fc02b
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 18:41:52 2018

crosskylabadmin: Fix bug in installing service handlers

BUG= chromium:855799 

Change-Id: I4889b1a014a38ac395e64c2ecbc5c4fef16529af
Reviewed-on: https://chromium-review.googlesource.com/1161045
Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>

[modify] https://crrev.com/1dbd18ba1a7eb6b347c7c0e6d9617840ac9fc02b/go/src/infra/appengine/crosskylabadmin/app/frontend/frontend.go

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/24dd6e819d580b3ce9c88c6f368cb07e767a1b6e

commit 24dd6e819d580b3ce9c88c6f368cb07e767a1b6e
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 19:05:43 2018

crosskylabadmin: Restructure entry package for devserver

AE devserver requires the entry point of the app to be in a leaf
package.

BUG= chromium:855799 

Change-Id: I1946e79bbcfdedbad4bb4e61c3e482de5586590f
Reviewed-on: https://chromium-review.googlesource.com/1161046
Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>

[rename] https://crrev.com/24dd6e819d580b3ce9c88c6f368cb07e767a1b6e/go/src/infra/appengine/crosskylabadmin/app/appengine/app.yaml
[add] https://crrev.com/24dd6e819d580b3ce9c88c6f368cb07e767a1b6e/go/src/infra/appengine/crosskylabadmin/app/appengine/appengine.infra_testing
[rename] https://crrev.com/24dd6e819d580b3ce9c88c6f368cb07e767a1b6e/go/src/infra/appengine/crosskylabadmin/app/appengine/cron.yaml
[rename] https://crrev.com/24dd6e819d580b3ce9c88c6f368cb07e767a1b6e/go/src/infra/appengine/crosskylabadmin/app/appengine/handlers.go

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/30c4578bc4c30caaffe1a8218687ba2be4479bd9

commit 30c4578bc4c30caaffe1a8218687ba2be4479bd9
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 21:41:45 2018

crosskylabadmin: Add config refresh cron and validation

BUG= chromium:855799 

Change-Id: Ib317dfb1b49c73cdeea66049f85a410afce941c3
Reviewed-on: https://chromium-review.googlesource.com/1161047
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Ryan Tseng <hinoka@chromium.org>

[modify] https://crrev.com/30c4578bc4c30caaffe1a8218687ba2be4479bd9/go/src/infra/appengine/crosskylabadmin/app/config/config.go
[modify] https://crrev.com/30c4578bc4c30caaffe1a8218687ba2be4479bd9/go/src/infra/appengine/crosskylabadmin/app/appengine/app.yaml
[modify] https://crrev.com/30c4578bc4c30caaffe1a8218687ba2be4479bd9/go/src/infra/appengine/crosskylabadmin/app/appengine/cron.yaml
[modify] https://crrev.com/30c4578bc4c30caaffe1a8218687ba2be4479bd9/go/src/infra/appengine/crosskylabadmin/app/appengine/handlers.go

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6

commit fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6
Author: Prathmesh Prabhu <pprabhu@chromium.org>
Date: Thu Aug 02 23:47:14 2018

crosskylabadmin: Use configuration injected via luci-config

BUG= chromium:855799 

Change-Id: I6ceab99498f941844cbec1d947f0a3fe1ed7860a
Reviewed-on: https://chromium-review.googlesource.com/1157134
Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>

[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/tasker.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/cron/cron.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/tasker_test.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/tracker_test.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/frontend.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/config/config.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/test_common.go
[modify] https://crrev.com/fa7f6d23ebf6f638123acb4feaf8ab2e2cb611c6/go/src/infra/appengine/crosskylabadmin/app/frontend/tracker.go

Thanks to vadimsh@ as part of this effort, crosskylabadmin now works from the devserver. local develpment ftw!

This is done in essence. Have to push ToT versions to prod/staging and declare victory.