Using Feature Flags with label and null label values cause dynamic response from the feature manager

Question

Hi all, we had an issue with using feature flags.

We apply the code and expect to read all features and the labeled should always override the null labeled one.

   .UseFeatureFlags(featureFlagOptions =>  
                       {  
                           featureFlagOptions.Label = LabelFilter.Null;  
                       }).UseFeatureFlags(featureFlagOptions =>  
                       {  
                           featureFlagOptions.Label = label;  
                       })  

And as a result, we had a dynamic response from the feature manager with
During the first call, we had the label value, but then all the rest calls we had only null labeled values

Answer 1

Hi @Ivan Dobrynskyi ,

I'm not certain why you're chaining the call like that, but I would do the following:

   // Augment the ConfigurationBuilder with Azure App Configuration  
   // Pull the connection string from an environment variable  
   configBuilder.AddAzureAppConfiguration(options => {  
       options.Connect(configuration["connection_string"])  
              .Select("CustomFeature*", LabelFilter.Null)  
              .Select("CustomFeature*", "label")  
              .UseFeatureFlags();  
   });  

This allows you to pull CustomFeature key value pairs along based on the feature flag it's associated with.

• https://learn.microsoft.com/en-us/azure/azure-app-configuration/quickstart-feature-flag-dotnet
• https://learn.microsoft.com/en-us/azure/azure-app-configuration/howto-best-practices