Options investigation (Aspire standalone/HealthChecks.UI/Gatus/Homepage/
Grafana vs custom) → decision: custom ZB.MOM.WW.Overview Blazor app in the
family look. Design: anonymous read-only single pane, appsettings registry
of all four apps' instances, cache-first poller on a configurable timer,
configurable staleness timeout, Active/Standby from /health/active, and
per-cluster Akka leader chips (needs Health 0.2.0 optional per-entry data).
Impl plan: phased + code-verified — Phase 0 Health 0.2.0 (writer data field
+ AkkaClusterHealthCheck cluster view), Phase 1 ScadaBridge site-node
MapZbHealth PR (:8084; role-scoped active check), Phase 2 OtOpcUa bump,
Phase 3 the app (:5320), Phase 4 live rig acceptance. Mockup is the visual
reference: real Theme tokens + embedded IBM Plex, all card states incl.
stale + split-brain. Ready to execute in a fresh session.
Joseph Doherty
6dd7858619