A question was posted on site X, but it looks like it might be suitable on site Y. How should moderators and close-voters decide whether to migrate it to site Y? What criteria should be used?
This was a subject of a lengthy discussion among multiple site mods, and it became clear there is a broad range of opinions about this subject and apparently no definitive reference outlining an approach. So, this is an attempt to create a reference question, in hopes that it generates answers that help outline possible ways to think about this.