enum SystemLogKey {
L2_TO_L1_LOGS_TREE_ROOT_KEY,
PACKED_BATCH_AND_L2_BLOCK_TIMESTAMP_KEY,
CHAINED_PRIORITY_TXN_HASH_KEY,
NUMBER_OF_LAYER_1_TXS_KEY,
// Note, that it is important that `PREV_BATCH_HASH_KEY` has position
// `4` since it is the same as it was in the previous protocol version and
// it is the only one that is emitted before the system contracts are upgraded.
PREV_BATCH_HASH_KEY,
L2_DA_VALIDATOR_OUTPUT_HASH_KEY,
USED_L2_DA_VALIDATOR_ADDRESS_KEY,
MESSAGE_ROOT_ROLLING_HASH_KEY,
L2_TXS_STATUS_ROLLING_HASH_KEY,
EXPECTED_SYSTEM_CONTRACT_UPGRADE_TX_HASH_KEY
}