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We define unused artifacts as those that aren't consumed by any
action. This can be because an action produced more outputs than
a dependent action needed, or because it's a top level artifact
and we don't care about its contents, just that it was built
without issue. Actions may prevent outputs from being discarded
by declaring them as mandatory. This is particularly useful for
test outputs. The motivation behind this change is to reduce
storage overhead for things we can do without.
It is worth noting this change doesn't cover all cases. In particular
it has difficulty identifying *_binary artifacts as orphaned. This
is due to the insertion of a virtual runfiles artifact which depends
upon the rule's outputs.
--
MOS_MIGRATED_REVID=88467504
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Janak Ramakrishnan
Michajlo Matijkiw
Han-Wen Nienhuys