Function spl_stake_pool::instruction::add_validator_to_pool

pub fn add_validator_to_pool(
    program_id: &Pubkey,
    stake_pool: &Pubkey,
    staker: &Pubkey,
    reserve: &Pubkey,
    stake_pool_withdraw: &Pubkey,
    validator_list: &Pubkey,
    stake: &Pubkey,
    validator: &Pubkey,
    seed: Option<NonZeroU32>
) -> Instruction

Creates AddValidatorToPool instruction (add new validator stake account to the pool)