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actually rebuild the registry, pass `True` for *rebuild*.
:param bool rebuild: If set to `True` (not the default),
this method will actually register and subscribe utilities
in the registry as needed to synchronize with the local cache.
:return: A dictionary that's meant as diagnostic data. The keys
and values may change over time. When called with a false *rebuild*,
the keys ``"needed_registered"`` and ``"needed_subscribed"`` will be
non-zero if any corruption was detected, but that will not be corrected.
.. versionadded:: 5.3.0
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