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Description
The current API call to get information about attestation behavior for a validator at a given epoch, /lighthouse/validator_inclusion/{epoch}/{validator_id} is limited to a single validator_id. Earlier versions of the lighthouse API allowed a query to contain multiple validator_id's, which is useful to extract data about attestation behavior.
The simplest solution would be to introduce a "/lighthouse/validator_inclusion/{epoch}/all" that returns the attestation behavior for all validators for a given epoch. Alternatively, a request body could be allowed that contains an epoch and a set of multiple validator id's, similar to the previous API.