Update Octobot ArgoCD strategy digest.

Change Summary

This change updates the image update strategy for the octobot Argo CD application from semver to digest.

Technical Details

• File: IaC/modules/octobot/main.tf
• Change: ```diff
  • “argocd-image-updater.argoproj.io/octobot.update-strategy” = “semver”
  • “argocd-image-updater.argoproj.io/octobot.update-strategy” = “digest” ```
• Explanation:
  • The argocd_application resource for octobot had its update strategy modified.
  • Previously, the strategy was set to semver, which updates the image based on semantic versioning.
  • Now, it is set to digest, which updates the image only when the image digest changes.

Key Learnings & Insights

• Reasoning:
  • The change to digest ensures that the application uses the exact image that was built and tested, reducing the risk of deploying an unintended version.
  • Semantic versioning (semver) can lead to deploying a new patch version that might contain unexpected changes.
• Problem-Solving Approach:
  • Identified the need for more precise control over image updates to avoid potential issues with new patch versions.
  • Chose digest to ensure that the deployed image is identical to the one that passed all tests.
• Best Practices:
  • Using image digests is a best practice for ensuring consistency and reliability in deployments.
  • This approach minimizes the risk associated with automatic updates.

Impact Assessment

• System Impact:
  • The application will now only update when the image digest changes, ensuring that the exact image is deployed.
• Performance Implications:
  • No direct performance impact, but potentially fewer updates, which could slightly reduce the load on the CI/CD pipeline.
• Security & Maintainability:
  • Enhances security by ensuring that only tested images are deployed.
  • Improves maintainability by reducing the chances of deploying unintended changes.

Developer Notes

• Gotchas:
  • Ensure that the CI/CD pipeline is configured to update the image digest correctly.
  • Verify that the Argo CD application syncs properly after this change.
• Future Improvements:
  • Consider automating the process of updating the image digest in the Terraform configuration as part of the CI/CD pipeline.
  • Monitor the deployment frequency and adjust the strategy if necessary based on team feedback and deployment patterns.