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3rd chunk of `Documentation/BreakingChanges.adoc`
e46ca6b923eeac7b930b8ef79787706ad4b766a11216967100000001000008bf
 "sha256" object format. This includes popular Git libraries,
applications and forges.
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There is no plan to deprecate the "sha1" object format at this point in time.
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Cf. <2f5de416-04ba-c23d-1e0b-83bb655829a7@zombino.com>,
<20170223155046.e7nxivfwqqoprsqj@LykOS.localdomain>,
<CA+EOSBncr=4a4d8n9xS4FNehyebpmX8JiUwCsXD47EQDE+DiUQ@mail.gmail.com>.

=== Removals

* Support for grafting commits has long been superseded by git-replace(1).
  Grafts are inferior to replacement refs:
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  ** Grafts are a local-only mechanism and cannot be shared across
     repositories.
  ** Grafts can lead to hard-to-diagnose problems when transferring objects
     between repositories.
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The grafting mechanism has been marked as outdated since e650d0643b (docs: mark
info/grafts as outdated, 2014-03-05) and will be removed.
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Cf. <20140304174806.GA11561@sigill.intra.peff.net>.

* The git-pack-redundant(1) command can be used to remove redundant pack files.
  The subcommand is unusably slow and the reason why nobody reports it as a
  performance bug is suspected to be the absence of users. We have nominated
  the command for removal and have started to emit a user-visible warning in
  c3b58472be (pack-redundant: gauge the usage before proposing its removal,
  2020-08-25) whenever the command is executed.
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So far there was a single complaint about somebody still using the command, but
that complaint did not cause us to reverse course. On the contrary, we have
doubled down on the deprecation and starting with 4406522b76 (pack-redundant:
escalate deprecation warning to an error, 2023-03-23), the command dies unless
the user passes the `--i-still-use-this` option.
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There have not been any subsequent complaints, so this command will finally be
removed.
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Cf. <xmqq1rjuz6n3.fsf_-_@gitster.c.googlers.com>,
    <CAKvOHKAFXQwt4D8yUCCkf_TQL79mYaJ=KAKhtpDNTvHJFuX1NA@mail.gmail.com>,
    <20230323204047.GA9290@coredump.intra.peff.net>,

* Support for storing shorthands for remote URLs in "$GIT_COMMON_DIR/branches/"
  and "$GIT_COMMON_DIR/remotes/" has been long superseded by storing remotes in
  the repository configuration.
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The mechanism has originally been introduced in f170e4b39d ([PATCH] fetch/pull:
short-hand notation for remote
Title: Git Removals and Deprecations
Summary
The Git project is removing several features, including support for grafting commits, the git-pack-redundant command, and storing shorthands for remote URLs in certain directories, as they have been superseded by alternative mechanisms such as replacement refs and repository configuration, and are no longer widely used.