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docs: ServiceHosting.md overlay-filename casing note; R3-04 review outcome (both FIX-FIRST items resolved)

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Joseph Doherty
2026-08-20 11:03:24 -04:00
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@@ -32,7 +32,7 @@ Single-node dev: `OTOPCUA_ROLES=admin,driver` (or the `Cluster:Roles` equivalent
### Per-role configuration overlays
`Program.cs` builds a role suffix by joining the resolved `EffectiveRoles.Gossiped` roles **alphabetically** with `-` and loads `appsettings.{roleSuffix}.json` as an optional overlay on top of base `appsettings.json`. Three overlays ship in `src/Server/ZB.MOM.WW.OtOpcUa.Host/`:
`Program.cs` builds a role suffix by joining the resolved `EffectiveRoles.Gossiped` roles **alphabetically** with `-` and loads `appsettings.{roleSuffix}.json` as an optional overlay on top of base `appsettings.json`. A plain role (`admin`/`driver`/`dev`) is always lower-case in `Gossiped` regardless of how the operator spelled it, so the overlay filename for those is stable (`appsettings.driver.json`); if a `cluster-{ClusterId}` role is also configured, its suffix carries into the filename **verbatim** (e.g. `Cluster:Roles: ["driver", "cluster-SITE-A"]` loads `appsettings.cluster-SITE-A-driver.json`), since `Gossiped` preserves that spelling by design (see [Configuration.md § `Roles`](Configuration.md#appsettings-sections)). Three overlays ship in `src/Server/ZB.MOM.WW.OtOpcUa.Host/`:
- `appsettings.admin.json` — admin-only nodes
- `appsettings.driver.json` — driver-only nodes