IMO NixOS has the right stalebot settings[0]. It was discussed thouroughly in the RFC, as to choose the right information text and other actions by the bot. For example, the bot will only mark the issue/PR as stale and will never close the issue or lock it. Issues are only ever closed by humans.
The information text they came up with is quite a bit longer than the ansible one[1]. I think this is a very important point when adding such a bot, otherwise the user will be left helpless.