Sup0108 A Deployment Or Update Operation Is Already In Progress Best -

"error": "sup0108", "message": "A deployment or update operation is already in progress", "retry_after_seconds": 30

sfdx force:mdapi:listdeployments -u <target_org>

Ensure your Jenkins or GitHub Actions pipelines are set to "wait" or "fail fast" if a build is already active.

: This message sometimes appears even when no operation is active if the Lifecycle Controller was not closed properly. Alternative Update Methods

The system is still processing a large package in the background. Best Solutions to Fix SUP0108 1. The "Wait and Refresh" Method