question: private EtcdKeysResponse handleEtcdWatchErrors ( EtcdException exception ) { if ( exception . errorCode == ETCD_EVENT_INDEX_CLEARED_CODE ) { initialSetAllFlagz ( ) ; return null ; } else if ( exception . errorCode == ETCD_WATCHER_CLEARED_CODE ) { try { Thread . sleep ( reelectionBackoffMs . get ( ) ) ; } catch ( InterruptedException e1 ) { } return null ; } else { throw new EtcdFlagFieldUpdaterException . EtcdFetchingFailed ( exception ) ; } }
target:  Handles watch issues with watching. See Etcd docs: