A special metadata key “fallback_list“ will be used to provide variants of metadata to try.

If ANY_ENDPOINT is selected, any cluster endpoint may be returned (subject to policy, health checks, etc).

If DEFAULT_SUBSET is selected, load balancing is performed over the endpoints matching the values from the default_subset field.

If KEYS_SUBSET is selected, subset selector matching is performed again with metadata keys reduced to :ref:`fallback_keys_subset<envoy_v3_api_field_extensions.load_balancing_policies.subset.v3.Subset.LbSubsetSelector.fallback_keys_subset>`.

If NO_FALLBACK is selected, a result equivalent to no healthy hosts is reported.

If NOT_DEFINED top level config fallback policy is used instead.

No fallback.

Enum value maps for Subset_LbSubsetFallbackPolicy.

Enum value maps for Subset_LbSubsetFallbackPolicy.

Enum value maps for Subset_LbSubsetMetadataFallbackPolicy.

Enum value maps for Subset_LbSubsetMetadataFallbackPolicy.

Enum value maps for Subset_LbSubsetSelector_LbSubsetSelectorFallbackPolicy.

Enum value maps for Subset_LbSubsetSelector_LbSubsetSelectorFallbackPolicy.

Optionally divide the endpoints in this cluster into subsets defined by endpoint metadata and selected by route and weighted cluster metadata.

Specifications for subsets.

Subset_LbSubsetSelectorValidationError is the validation error returned by Subset_LbSubsetSelector.Validate if the designated constraints aren't met.

SubsetValidationError is the validation error returned by Subset.Validate if the designated constraints aren't met.

If NO_FALLBACK is selected, a result equivalent to no healthy hosts is reported.

Allows to override top level fallback policy per selector.

Subset_LbSubsetSelectorMultiError is an error wrapping multiple validation errors returned by Subset_LbSubsetSelector.ValidateAll() if the designated constraints aren't met.

SubsetMultiError is an error wrapping multiple validation errors returned by Subset.ValidateAll() if the designated constraints aren't met.