AccountingOracle is a contract where oracles send addresses' balances controlled by the DAO on the Consensus Layer side. The balances can go up because of reward accumulation and can go down due to slashing and staking penalties. Oracles are assigned by the DAO.
Other major responsibilities of AccountingOracle: updating exited and stuck validators, finalizing withdrawal requests.
However, daily oracle reports shouldn't be taken for granted. Oracle daemons could stop pushing their reports for extended periods of time in case of no finality on Consensus Layer. This would ultimately result in no oracle reports and no stETH rebases for this whole period.