The ninth batch

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/2.52.0.adoc

@@ -20,6 +20,10 @@ UI, Workflows & Features
  * "git refs exists" that works like "git show-ref --exists" has been
    added.
 
+ * "repo info" learns a short-hand option "-z" that is the same as
+   "--format=nul", and learns to report the objects format used in the
+   repository.
+
 
 Performance, Internal Implementation, Development Support etc.
 --------------------------------------------------------------
@@ -55,6 +59,10 @@ Performance, Internal Implementation, Development Support etc.
    which items are still on the queue (an unacceptable alternative is
    to reserve one object flag bits).
 
+ * The bulk-checkin code used to depend on a file-scope static
+   singleton variable, which has been updated to pass an instance
+   throughout the callchain.
+
 
 Fixes since v2.51
 -----------------
@@ -164,6 +172,11 @@ including security updates, are included in this release.
    which has been disabled in Gitlab CI.
    (merge 608cf5b793 ps/gitlab-ci-disable-windows-monitoring later to maint).
 
+ * A broken or malicious "git fetch" can say that it has the same
+   object for many many times, and the upload-pack serving it can
+   exhaust memory storing them redundantly, which has been corrected.
+   (merge 88a2dc68c8 ps/upload-pack-oom-protection later to maint).
+
  * Other code cleanup, docfix, build fix, etc.
    (merge 823d537fa7 kh/doc-git-log-markup-fix later to maint).
    (merge cf7efa4f33 rj/t6137-cygwin-fix later to maint).
@@ -182,3 +195,6 @@ including security updates, are included in this release.
    (merge 2f4bf83ffc km/alias-doc-markup-fix later to maint).
    (merge b0d97aac19 kh/doc-markup-fixes later to maint).
    (merge f9a6705d9a tc/t0450-harden later to maint).
+   (merge c25651aefd ds/midx-write-fixes later to maint).
+   (merge 069c15d256 rs/object-name-extend-abbrev-len-update later to maint).
+   (merge bf5c224537 mm/worktree-doc-typofix later to maint).