Dark Launching Pattern

1. Introduction

The Dark Launching Pattern is a software architecture pattern used to deploy new features in a way that they are not immediately visible to users. This allows teams to test features with a limited audience and gather data before full deployment.

2. Key Concepts

**Feature Toggles:** Control the availability of features.
**Limited Visibility:** Users can access the feature without knowing it exists.
**Data Collection:** Gather metrics and feedback without impacting the entire user base.

3. Implementation Steps

Identify the feature to be dark launched.
Implement feature toggles in your codebase.
Deploy the feature to a subset of users.
Collect data and monitor performance.
Analyze feedback and metrics.
Decide whether to roll out the feature to all users or revise it.

4. Best Practices

Always ensure that your feature toggles are easily manageable to avoid technical debt.

Keep the toggles short-lived.
Use automated testing to ensure quality.
Communicate with stakeholders about the dark launch.

5. FAQ

What is the main benefit of dark launching?

The main benefit is the ability to test new features in a controlled manner without impacting the entire user base.

How do I ensure my feature toggle is effective?

Ensure that your toggles can be easily managed and monitored, and always back them up with data collection.

Flowchart for Dark Launching Process


        graph TD;
            A[Identify Feature] --> B[Implement Feature Toggles];
            B --> C[Deploy to Subset of Users];
            C --> D[Collect Data];
            D --> E[Analyze Feedback];
            E --> F{Rollout Decision};
            F -->|Yes| G[Rollout to All Users];
            F -->|No| H[Revise Feature];