apt update causes "Repository 'http://packages.nginx.org/nginx-agent/ubuntu noble InRelease' changed its 'Label' value from '' to 'nginx-agent'"

Bug Overview

I'm trying to do an apt update on Ubuntu 24.04 for Raspberry Pi 5. When I do a sudo apt update && sudo apt full-upgrade, I get this message:

E: Repository 'http://packages.nginx.org/nginx-agent/ubuntu noble InRelease' changed its 'Label' value from '' to 'nginx-agent'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.

How can I verify this change was intentional and legitimately made by the nginx staff? If it is safe to proceed with these changes, how do I tell apt to accept the changes so it updates again?

Expected Behavior

successful update

Steps to Reproduce the Bug

sudo apt update && sudo apt full-upgrade

Environment Details

• Target deployment platform: [e.g. AWS/GCP/local cluster/etc...]
• Target OS: [e.g. RHEL 9/Ubuntu 24.04/etc...]
• Version of this project or specific commit: [e.g. 1.4.3/commit hash]
• Version of any relevant project languages: [e.g. Kubernetes 1.30/Python 3.9.7/etc...]

Additional Context

No response

Start with the reported sudo apt update && sudo apt full-upgrade entry point and inspect the nginx-agent Ubuntu 24.04 repository metadata alongside the apt-secure guidance. Determine whether the repository Label change was intentional and whether the repository or its user-facing instructions need updating; done means the update completes without the reported error.