expert (E4): a week of the observability queue on a large legacy Prometheus/Alertmanager repo, graded by…

expert (E4): a week of the observability queue on a large legacy Prometheus/Alertmanager repo, graded by…: a task in 3ambench (Harbor dataset). payments-gw got its own SLO in the catalog this sprint ( slo/services.yaml ). It needs the fast-burn page per ADR 0008, named the usual way.