Do not nest type Roles. Alternatively, change its accessibility so that it is not externally visible. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1034)

Do not nest type KnownClaims. Alternatively, change its accessibility so that it is not externally visible. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1034)

Change 'List<string>' in 'SubscriptionPipelineResult.GroupKeys' to use 'Collection<T>', 'ReadOnlyCollection<T>' or 'KeyedCollection<K,V>' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1002)

Rename virtual/interface member BasicTopicKeys<TT>.Get(TT) so that it no longer conflicts with the reserved language keyword 'Get'. Using a reserved keyword as the name of a virtual/interface member makes it harder for consumers in other languages to override/implement the member. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1716)

Rename virtual/interface member BasicTopicKeys<TT, TN1>.Get(TT) so that it no longer conflicts with the reserved language keyword 'Get'. Using a reserved keyword as the name of a virtual/interface member makes it harder for consumers in other languages to override/implement the member. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1716)

Change 'List<string>' in 'SubscriptionPipelineResult.SubscriptionPipelineResult(SubscriptionStatus, List<string>)' to use 'Collection<T>', 'ReadOnlyCollection<T>' or 'KeyedCollection<K,V>' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1002)

Consider calling ConfigureAwait on the awaited task (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2007)

In externally visible method 'ITopic? DefaultTopicExtractor.Extract(SubscriptionEnvelope envelope)', validate parameter 'envelope' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

In externally visible method 'Task TopicExistenceChecker.Consume(ConsumeContext<CheckIfTopicIsRecognized> context)', validate parameter 'context' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)