safeMode

Whether the system is running in a downgraded safe mode due to a non-recoverable bug. This is set whenever we failed to execute advance_epoch, and ended up executing advance_epoch_safe_mode. It can be reset once we are able to successfully execute advance_epoch. The rest of the fields starting with safe_mode_ are accumulated during safe mode when advance_epoch_safe_mode is executed. They will eventually be processed once we are out of safe mode.