metadataFilters property

Opaque filter criteria used by the load balancer to restrict routing configuration to a limited set of xDS compliant clients.

In their xDS requests to the load balancer, xDS clients present node metadata. When there is a match, the relevant routing configuration is made available to those proxies. For each metadataFilter in this list, if its filterMatchCriteria is set to MATCH_ANY, at least one of the filterLabels must match the corresponding label provided in the metadata. If its filterMatchCriteria is set to MATCH_ALL, then all of its filterLabels must match with corresponding labels provided in the metadata. If multiple metadata filters are specified, all of them need to be satisfied in order to be considered a match. metadataFilters specified here is applied after those specified in ForwardingRule that refers to the UrlMap this HttpRouteRuleMatch belongs to. metadataFilters only applies to load balancers that have loadBalancingScheme set to INTERNAL_SELF_MANAGED. Not supported when the URL map is bound to a target gRPC proxy that has validateForProxyless field set to true.