rsnext/docs/api-reference/next.config.js/configuring-the-build-id.md

description
Configure the build id, which is used to identify the current build in which your application is being served.

Configuring the Build ID

Next.js uses a constant id generated at build time to identify which version of your application is being served. This can cause problems in multi-server deployments when next build is ran on every server. In order to keep a static build id between builds you can provide your own build id.

Open next.config.js and add the generateBuildId function:

module.exports = {
  generateBuildId: async () => {
    // You can, for example, get the latest git commit hash here
    return 'my-build-id'
  },
}