what should I use instead of custom rollout code

If you mean deployment rollout code (scripts that move traffic, restart services, or coordinate phased releases), the usual replacement is to use a platform or controller that already handles rollout strategy.

Good options:

• Kubernetes native

  • Deployments for standard rolling updates
  • Argo Rollouts for canary, blue/green, analysis-based releases
  • Flagger for automated progressive delivery

• Cloud provider deployment tools

  • AWS CodeDeploy
  • Google Cloud Deploy
  • Azure DevOps Release Pipelines

• CI/CD pipeline tools

  • GitHub Actions
  • GitLab CI/CD
  • Jenkins
  • CircleCI

  Use these to orchestrate deployments, but let the platform do the actual rollout mechanics.

• Feature flags

  • LaunchDarkly
  • Unleash
  • Split

  Best when you want to decouple release from deployment.

If you’re currently using custom rollout code, the best replacement depends on what it does:

• restart/update instances → Kubernetes Deployment / ECS rolling update / cloud deploy tool
• canary traffic shifting → Argo Rollouts / Flagger / service mesh
• gradual feature exposure → feature flags
• manual coordination and checks → CI/CD pipeline with approval gates

If you want, I can recommend the best replacement for your exact setup (for example: Kubernetes, ECS, VM-based app, serverless, etc.).