Release version shows as unknown on deployment preview in Bamboo Data Center
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
This article explains why release version has an unknown tag associated to it during the deployment, refer the image below :

Environment
This issue is applicable for any Bamboo version >=9.4.x
Solution
In Bamboo 9.4 release there was a new feature introduced to Safeguard your deployment environments against unapproved releases.
To help you make sure that a bad release never takes down your whole production environment (or never does that again), deployment environments now let you set their release approval policy. The policy lets you define the conditions a release must meet before it can be deployed. That is, which environments accept all releases, which ones accept approved releases, and which ones only accept releases that haven’t been marked as broken. If you change your mind later, just update the environment’s settings and you’re good to go.
Learn more about the release approval policy for deployment environments
Because of this, the releases have now got a extra tag associated with them. UNKNOWN basically means that the release is neither approved nor broken.
Case 1:
Release 1 is showing as UNKNOWN because it was neither approved nor marked broken but it has been deployed it to some environment.
Case 2:
Release 2 is showing as Approved because it has been approved after it was deployed.
Was this helpful?