How to Release Your Upgrade: Approaches and Considerations

You have successfully tested your upgrade and are now dev-complete. The final stage of the execution process is to plan and execute the merge of your upgrade branch back into the main codebase, making it the new standard for all future development.

A smooth merge is the result of careful coordination and communication. This guide provides a step-by-step checklist to ensure your upgrade is integrated without disruption.

Step 1: The Final Polish - Apply the Latest Patch

Before you begin the sign-off and merge process, ensure you are integrating the best possible version of the software.

It is strongly recommended to update your upgrade branch to the latest available minor version or patch for your target release (e.g., if you upgraded to v2.8.2, check if v2.8.3 is now available). These releases contain the latest bug fixes and security updates but no breaking changes, making them low-risk to apply.

• You can find instructions for this process in the documentation on applying a minor upgrade.

Step 2: Gain Stakeholder Sign-Off

Before planning the merge, you must get formal approval from all relevant stakeholders. Do not wait until the last minute for this; seek sign-off as soon as individual components are ready for review.

Action: Secure approval from the following groups:

• Product Owners / Business Users: Present your UAT results and regression reports to demonstrate that the functionality is correct and performance is acceptable.
  
  
• Technical Leads / Architects: Get your code reviewed. Your Pull Requests should be approved well in advance of the target merge date to allow time for feedback and iteration.
  
  
• Downstream Consumers: If other teams or applications consume your project's APIs or data outputs, ensure they have been part of the testing and have signed off on the changes.

Pro-Tip: If your ETL upgrade was completed first, get it reviewed and signed off while the rest of the upgrade is still being tested.

Step 3: Prepare and Educate Your Users

Proactive communication is key to a smooth transition for everyone involved with the project.

Action: Prepare your user groups for the upcoming change.

• For Technical Users (Developers): Produce a clear changelog or technical release notes. Inform them of any changes to development environments, deployment strategies, or key data structures that will impact their day-to-day work once the merge is complete.
  
  
• For End-Users (Investigators, Analysts): Provide an updated user guide or release communication that documents any major changes to the User Interface (UI) or application functionality that they will see in the next production release.

Step 4: Plan the Merge Logistics

This step involves defining the precise technical strategy for merging your code.

Action: Define your merge plan, considering project structure.

• For Split Repositories: Your merge plan must respect inter-repository dependencies. For example, a shared "model" repository must be merged, published, and consumed by the "ETL" and "Apps" repositories before they themselves can be merged. Document the exact order of operations.
  
  
• For Multi-Use Case Platforms: Refer back to your upgrade plan. Ensure that the merge of your upgraded use case will not negatively impact the build or development process for other use cases running on the same platform.

Step 5: Coordinate and Execute the Merge to Main

This is the final, coordinated event to integrate the upgrade into your main codebase.

Action: Follow this checklist for a smooth merge:

1. Set a Merge Date: Align with all development teams on a specific date and time for the merge.
   
   
2. Communicate a Merge Freeze: Announce a "merge freeze" for the main branch leading up to the agreed-upon merge time. This prevents last-minute, unrelated changes from introducing conflicts or instability.
   
   
3. Prepare a Rollback Strategy: Have a documented plan in place for how you would revert the merge commit (e.g., using git revert) in the unlikely event of a critical, unexpected issue post-merge.
   
   
4. Execute the Merge: With all preparations in place, merge your feature/platform-upgrade branch into main.
   
   
5. Post-Merge Communication: Announce to all technical teams that the merge is complete. All new feature development must now branch from the updated main branch.

With the merge complete, your upgrade is now part of the main line of development. It will be deployed to production as part of your project's next standard release, following your organization's established release playbook.