#5691 "Generic Prometheus dashboard widget: pick a target and a template", step 3 of milestone 508 "Prometheus widget templates". - /plugins/prometheus/widget draws one target with one template in widget shape: the verdict (led by "isn't answering" when the target is down), then each block with problems first, figures beside a share bar or the last 24h of bars, and the healthy rest folding to "+N more healthy" past six. A missing target or template, or one that no longer checks, says so. - library.py: bundled templates from plugins/prometheus/widgets/*.yaml, the picker's target and template lists, and the default title. - widgets/fabled_archives.yaml: the first bundled template, against the series Archives reports (refined in #5693). - Dashboard: a widget setting may take `options_from` (read when the picker opens) with an `empty` sentence; `default_title`; a Details link may name settings ("/plugins/prometheus/targets/{target}"). Prometheus is grouped with the integrations. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>