HttpRouteFilters Docs and webhook do not match.

[LiorLieberman]

What happened:
HttpRouteFilters Docs and webhook do not match.

The docs/api field description say:

gateway-api/apis/v1beta1/httproute_types.go

Lines 204 to 205 in f2cd9bb

	// Specifying a core filter multiple times has unspecified or
	// implementation-specific conformance.

And it seems that the webhook does not allow multiple features from the same type (unless it is HTTPRouteFilterExtensionRef)

gateway-api/apis/v1beta1/validation/httproute.go

Lines 137 to 142 in f2cd9bb

	for filterType, count := range counts {
	if count > 1 {
	errs = append(errs, field.Invalid(path.Child("filters"), filterType, "cannot be used multiple times in the same rule"))
	}
	}
	return errs

What you expected to happen:

Expected both to match.

Would vote for changing the webhook to allow and clarify in the docs that repeatable is implementation-specific.

cc: @howardjohn

[howardjohn]

Note we have gotten a few requests for multiple mirrors in Istio: istio/istio#13330. This isn't in our API today, but could be exposed via multiple Mirror filters

[LiorLieberman]

/assign @LiorLieberman