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Hardforks are consensus layer types of the OP Stack. kona-hardforks most directly exports the Hardforks type that provides the network upgrade transactions for OP Stack hardforks including the following. Each hardfork has its own type in kona-hardforks that exposes the network upgrade transactions for that hardfork. For example, the Ecotone type can be used to retrieve the Ecotone network upgrade transactions through its txs() -> impl Iterator<Bytes> method. 
// Notice, the `Hardfork` trait must be imported in order to
// provide the `txs()` method implemented for the hardfork type.
use kona_hardforks::{Hardfork, Ecotone};
let ecotone_upgrade_txs = Ecotone.txs();
assert_eq!(ecotone_upgrade_txs.collect::<Vec<_>>().len(), 6);
Conveniently, the Hardforks type exposes each hardfork type as a field that can be directly referenced without needing to import all the different hardforks. 
use kona_hardforks::{Hardfork, Hardforks};
let ecotone_upgrade_txs = Hardforks::ECOTONE.txs();
assert_eq!(ecotone_upgrade_txs.collect::<Vec<_>>().len(), 6);