KEP 98: Promotion Phase for GitOps use cases

text/0098-promotion-phase.md

@@ -0,0 +1,42 @@
+# Promotion Phase for GitOps use cases
+
+Add a new lifecycle phase after post deployment dedicated to GitOps promotion tasks.
+
+**State: DRAFTING**
+
+## Motivation
+
+Since one of the main use cases for Keptn is enhancement of GitOps workflows, we should have bigger focus on that
+by introducing a dedicated stage after the post-deployment phase for GitOps promotion tasks.
+This will make it much clearer for Keptn users how to set up their GitOps-assisted workflows in multi-stage
+environments.
+
+## Explanation
+
+The new promotion phase can be used by adding a list of references to `KeptnTaskDefinition` resources to a new field
+called `promotionTasks` inside the `KeptnAppContext` CRD. Keptn will use this list the same way as for other phases
+like post-deployment and execute the referenced tasks in parallel using Kubernetes Job resources.
+
+## Trade-offs and mitigations
+
+No real drawbacks come to mind, except some slight slowdown in progression of the lifecycle since the new phase
+needs to be executed and the lifecycle-operator needs to check if any tasks need to be run.
+
+## Breaking changes
+
+This KEP would not have any breaking changes. The `KeptnAppContext` CRD would get an additional field called
+`PromotionTasks` which contains a list of references to `KeptnTaskDefintion` resources that should be executed in this
+phase.
+
+## Prior art and alternatives
+
+The alternative to this KEP is that users re-purpose the post-deployment phase for promotion, which would limit
+flexibility since users lose the option to not promote when post-deployment tasks fail.
+
+## Open questions
+
+For now, none.
+
+## Future possibilities
+
+For now, none.