Feature flags modes

Feature flags from environment

1. Prepare env variables using proper namings, export these environment variables.

   ff_back_dev_123_some_fixed_issue_231221_short=true
   ff_front_dev_456_my_super_feature_010122_long=true
   

   or run label-studio this way:
   ff_back_dev_123_some_fixed_issue_231221_short=true label-studio

Feature flags from file

1. Prepare feature_flags.yml file with flags:

   flagValues:
     ff_back_dev_123_some_fixed_issue_231221_short: true
     ff_front_dev_456_my_super_feature_010122_long: true
   

   Naming convention is presented here

   Read more about extended format

2. Set variables:

   FEATURE_FLAGS_FROM_FILE=true
   FEATURE_FLAGS_FILE=feature_flags.yml
   

Production mode

1. Set FEATURE_FLAGS_OFFLINE=false (by default)

Feature flags namings

fflag_<back|front|all>_<issue_id>_short_description_<date>_<short|long>

• short: short_term flags
• long: permanent flags or killswitchers

(check best practices from here)

How to use

Backend development

from core.feature_flags import flag_set

if flag_set('ff_back_dev_123_new_feature_231221_long', request.user):
    run_new_code()
else:
    run_old_code()

Frontend development

Feature flags JSON object is available on frontend via

window.APP_SETTINGS.feature_flags

To make use flags with LD client, populate it with bootstrap values