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Clarify value processing #133

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Merged
Michael Vittrup Larsen (michaelvl) merged 1 commit into from
Apr 13, 2023
Merged

Clarify value processing #133

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19 changes: 9 additions & 10 deletions doc/extended-configuration-w-policy-attachments.md
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Expand Up @@ -104,16 +104,15 @@ The *bifrost-gateway-controller* merges values before rendering templates
using the following order of precedence (aka. as *hierarchy* in
GEP-713):

Increasing order of precedence:

- `GatewayConfig` in same namespace as `Gateway`

- `GatewayClassConfig` in the same namespace as `Gateway` when `Gateway`
reference `GatewayClassConfig` indirectly through `GatewayClass`.

- `GatewayClassConfig` in *bifrost-gateway-controller* namespace when
`Gateway` reference `GatewayClassConfig` indirectly through
`GatewayClass`.
Increasing order of precedence for defaults, decreasing order of
precedence for override's as defined by GEP-713:

- Values from `GatewayClassBlueprint`
- Values from `GatewayClassConfig` in controller namespace (aka. global policies)
- Values from `GatewayClassConfig` in `Gateway`/`HTTPRoute` local namespace targeting namespace
- Values from `GatewayClassConfig` in `Gateway`/`HTTPRoute` local namespace targeting Gateway/HTTPRoute
- Values from `GatewayConfig` in `Gateway`/`HTTPRoute` local namespace, targeting namespace
- Values from `GatewayConfig` in `Gateway`/`HTTPRoute` local namespace, targeting `Gateway`/`HTTPRoute` resource

If there are multiple policies targeting the same resource and setting
the same variable, the result is undefined (see also [Conflict
Expand Down