When attempting to upgrade VMware Aria Operations for Logs, the Upgrade Cluster option is greyed out and unavailable within the Management > Cluster page.
VMware Aria Operations for Logs 8.18.x
This issue occurs because a valid license has not been applied to the product.
When an evaluation license expires and a permanent license is not assigned, VMware Aria Operations for Logs runs in Restricted Mode. While in Restricted Mode, the ability to upgrade the product to a newer version is disabled.
To resolve this issue, apply a valid permanent license to the environment:
Log in to the VMware Aria Operations for Logs user interface.
Navigate to Management > License.
Verify the current license status.
Add a valid permanent license key.
Navigate back to Management > Cluster.
Verify that the Upgrade Cluster option is now available.