After upgrading jenkins.war file from version 1.630 to 1.643, the project configuration screen does not display the "Restrict where this project can be run" setting.

Most projects tied to labels before the upgrade are somehow retained - I saw in the build queue that it was waiting for available executors with the appropriate label assigned.

One project did not retain the label and tried to build on a node that was not configured appropriately for that job. That's when I became aware that the label restriction setting was missing from the project configuration page entirely across all projects.

Removal of this setting was not listed in the changelogs.

Temporary fix: Node and Label parameter plugin installed. This plugin adds parameters to the build, which has added extra steps to the "Build Now" button, making builds more vulnerable to user-errors