A Prometheus target's token_from names the plugin that supplies its token at each scrape. Read its metrics makes the target; Use this sign-in moves one at that address across, keeping its name, filters and history. A refusal stops the connection, so one Try again or sign-in starts everything, and the sign-in is only sent to its own address. A 404 says how to turn on Home Assistant's Prometheus integration, as Steward doesn't change Home Assistant. Refused also joins the volatile columns a backup check ignores. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>