New Extensions
Extensions are installable packages which give CiviCRM new functionality, and this directory provides a centralized list of extensions which the CiviCRM community has created.
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It's a sledgehammer to disable all payment processors and notify admins when it sees 5 consecutive failed transactions.
https://en.wikipedia.org/wiki/RFM_(market_research)
Sometime groups were created several year back and no more used at moment, if these groups are type of Smart Group, then it lot of time build group cache when system have hundreds of smart group (which my be, no more used).
If the admin knows the usages of any group, then they can set a date to disable the group in advance.