# Functions
FindGarbage returns safe-to-delete revisions according to strategy.
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# Constants
DefaultStrategy deletes any expired revisions, except if they are needed to fullfill the MimimumRetired quota.
MinimumRetired is the minimum amount of retired revisions we should keep for rollbacks.
# Interfaces
Revision represents a picchu revision's state and ttl.
# Type aliases
Strategy is an enum for different strategies.