Investigation: Juniper: automatic block 'Maximum fee/fine balance" not removed after item renewed for patron with a large volume of loans

Original issue reported by Cornell (this ticket, MODPATBLK-109 ) - 'Max fee/fine balance' block is SOMETIMES not cleared despite the fact that fees/fines are closed after renewal. MODPATBLK-112 - the same as MODPATBLK-109 , only for check-in. 'Max fee/fine balance' block is SOMETIMES not cleared despite the fact that fess/fines are closed, but they were closed as a result of a check-in rather than renewal. 1 and 2 seem to have the same root cause - some of the FEE_FINE_BALANCE_CHANGE messages are not delivered from mod-feesfines to mod-patron-blocks for some reason. This would explain why it only happens sometimes and cannot be reproduced on other envs. It can be a pub-sub or Kafka issue and it can possibly affect other blocks. The fact that it happens after renewal in one case and after check-in in another case is, most probably, insignificant. Please check comment & workaround field in MODPATBLK-112 where there is a workaround for such cases - how to sync data when some of the messages are lost.