diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -161,6 +161,7 @@ from . import (
     phases,
     pushkey,
     pycompat,
+    scmutil,
     tags,
     url,
     util,
@@ -1810,6 +1811,7 @@ def handleobsmarker(op, inpart):
     if new:
         op.repo.ui.status(_('%i new obsolescence markers\n') % new)
     op.records.add('obsmarkers', {'new': new})
+    scmutil.registersummarycallback(op.repo, tr)
     if op.reply is not None:
         rpart = op.reply.newpart('reply:obsmarkers')
         rpart.addparam('in-reply-to', str(inpart.id), mandatory=False)
diff --git a/mercurial/obsutil.py b/mercurial/obsutil.py
--- a/mercurial/obsutil.py
+++ b/mercurial/obsutil.py
@@ -7,6 +7,10 @@
 
 from __future__ import absolute_import
 
+from . import (
+    phases,
+)
+
 class marker(object):
     """Wrap obsolete marker raw data"""
 
@@ -285,6 +289,28 @@ def foreground(repo, nodes):
             foreground = set(repo.set('%ln::', known))
     return set(c.node() for c in foreground)
 
+def getobsoleted(repo, tr):
+    """return the set of pre-existing revisions obsoleted by a transaction"""
+    torev = repo.unfiltered().changelog.nodemap.get
+    phase = repo._phasecache.phase
+    succsmarkers = repo.obsstore.successors.get
+    public = phases.public
+    addedmarkers = tr.changes.get('obsmarkers')
+    addedrevs = tr.changes.get('revs')
+    seenrevs = set(addedrevs)
+    obsoleted = set()
+    for mark in addedmarkers:
+        node = mark[0]
+        rev = torev(node)
+        if rev is None or rev in seenrevs:
+            continue
+        seenrevs.add(rev)
+        if phase(repo, rev) == public:
+            continue
+        if set(succsmarkers(node)).issubset(addedmarkers):
+            obsoleted.add(rev)
+    return obsoleted
+
 def successorssets(repo, initialnode, cache=None):
     """Return set of all latest successors of initial nodes
 
diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -13,6 +13,7 @@ import hashlib
 import os
 import re
 import socket
+import weakref
 
 from .i18n import _
 from .node import (
@@ -22,11 +23,13 @@ from .node import (
     wdirrev,
 )
 
+from .i18n import _
 from . import (
     encoding,
     error,
     match as matchmod,
     obsolete,
+    obsutil,
     pathutil,
     phases,
     pycompat,
@@ -1059,3 +1062,15 @@ class simplekeyvaluefile(object):
             lines.append("%s=%s\n" % (k, v))
         with self.vfs(self.path, mode='wb', atomictemp=True) as fp:
             fp.write(''.join(lines))
+
+def registersummarycallback(repo, otr):
+    """register a callback to issue a summary after the transaction is closed
+    """
+    reporef = weakref.ref(repo)
+    def reportsummary(tr):
+        """the actual callback reporting the summary"""
+        repo = reporef()
+        obsoleted = obsutil.getobsoleted(repo, tr)
+        if obsoleted:
+            repo.ui.status(_('obsoleted %i changesets\n') % len(obsoleted))
+    otr.addpostclose('00-txnreport', reportsummary)
diff --git a/tests/test-bookmarks-pushpull.t b/tests/test-bookmarks-pushpull.t
--- a/tests/test-bookmarks-pushpull.t
+++ b/tests/test-bookmarks-pushpull.t
@@ -484,6 +484,7 @@ Update to a successor works
   remote: adding file changes
   remote: added 2 changesets with 2 changes to 1 files (+1 heads)
   remote: 2 new obsolescence markers
+  remote: obsoleted 1 changesets
   updating bookmark Y
   $ hg -R ../a book
      @                         1:0d2164f0ce0d
diff --git a/tests/test-exchange-obsmarkers-case-A3.t b/tests/test-exchange-obsmarkers-case-A3.t
--- a/tests/test-exchange-obsmarkers-case-A3.t
+++ b/tests/test-exchange-obsmarkers-case-A3.t
@@ -212,6 +212,7 @@ test obsmarkers exchange.
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files (+1 heads)
   remote: 1 new obsolescence markers
+  remote: obsoleted 1 changesets
   ## post push state
   # obstore: main
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
@@ -227,6 +228,7 @@ test obsmarkers exchange.
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
   (run 'hg heads' to see heads, 'hg merge' to merge)
   ## post pull state
   # obstore: main
diff --git a/tests/test-exchange-obsmarkers-case-A6.t b/tests/test-exchange-obsmarkers-case-A6.t
--- a/tests/test-exchange-obsmarkers-case-A6.t
+++ b/tests/test-exchange-obsmarkers-case-A6.t
@@ -97,6 +97,7 @@ Actual Test (explicit push version)
   searching for changes
   no changes found
   remote: 1 new obsolescence markers
+  remote: obsoleted 1 changesets
   ## post push state
   # obstore: main
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
@@ -107,6 +108,7 @@ Actual Test (explicit push version)
   pulling from main
   no changes found
   1 new obsolescence markers
+  obsoleted 1 changesets
   ## post pull state
   # obstore: main
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
@@ -130,6 +132,7 @@ Actual Test (bare push version)
   searching for changes
   no changes found
   remote: 1 new obsolescence markers
+  remote: obsoleted 1 changesets
   ## post push state
   # obstore: main
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
@@ -141,6 +144,7 @@ Actual Test (bare push version)
   searching for changes
   no changes found
   1 new obsolescence markers
+  obsoleted 1 changesets
   ## post pull state
   # obstore: main
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
diff --git a/tests/test-obsmarker-template.t b/tests/test-obsmarker-template.t
--- a/tests/test-obsmarker-template.t
+++ b/tests/test-obsmarker-template.t
@@ -735,6 +735,7 @@ Test setup
   adding file changes
   added 1 changesets with 0 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 1 changesets
   (run 'hg heads' to see heads, 'hg merge' to merge)
   $ hg log --hidden -G
   o  changeset:   2:7a230b46bf61
diff --git a/tests/test-obsolete-bundle-strip.t b/tests/test-obsolete-bundle-strip.t
--- a/tests/test-obsolete-bundle-strip.t
+++ b/tests/test-obsolete-bundle-strip.t
@@ -205,6 +205,7 @@ Actual testing
   # unbundling: adding file changes
   # unbundling: added 1 changesets with 1 changes to 1 files (+1 heads)
   # unbundling: 2 new obsolescence markers
+  # unbundling: obsoleted 1 changesets
   # unbundling: (run 'hg heads' to see heads)
 
   $ testrevs 'desc("C-A")'
@@ -366,6 +367,7 @@ problematic)
   # unbundling: adding file changes
   # unbundling: added 1 changesets with 1 changes to 1 files (+1 heads)
   # unbundling: 1 new obsolescence markers
+  # unbundling: obsoleted 1 changesets
   # unbundling: (run 'hg heads' to see heads)
 
 bundling multiple revisions
@@ -957,6 +959,7 @@ Actual testing
   # unbundling: adding file changes
   # unbundling: added 1 changesets with 1 changes to 1 files (+1 heads)
   # unbundling: 6 new obsolescence markers
+  # unbundling: obsoleted 3 changesets
   # unbundling: (run 'hg heads' to see heads)
 
 Bundle multiple revisions
@@ -1057,6 +1060,7 @@ Bundle multiple revisions
   # unbundling: adding file changes
   # unbundling: added 2 changesets with 2 changes to 2 files (+2 heads)
   # unbundling: 7 new obsolescence markers
+  # unbundling: obsoleted 2 changesets
   # unbundling: (run 'hg heads' to see heads)
 
 * top one and initial precursors
@@ -1122,6 +1126,7 @@ Bundle multiple revisions
   # unbundling: adding file changes
   # unbundling: added 2 changesets with 2 changes to 2 files (+2 heads)
   # unbundling: 6 new obsolescence markers
+  # unbundling: obsoleted 3 changesets
   # unbundling: (run 'hg heads' to see heads)
 
 * top one and one of the split
@@ -1189,6 +1194,7 @@ Bundle multiple revisions
   # unbundling: adding file changes
   # unbundling: added 2 changesets with 2 changes to 2 files (+2 heads)
   # unbundling: 7 new obsolescence markers
+  # unbundling: obsoleted 2 changesets
   # unbundling: (run 'hg heads' to see heads)
 
 * all
diff --git a/tests/test-obsolete.t b/tests/test-obsolete.t
--- a/tests/test-obsolete.t
+++ b/tests/test-obsolete.t
@@ -613,6 +613,7 @@ Do not warn about new head when the new 
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
 
 test relevance computation
 ---------------------------------------
diff --git a/tests/test-push-checkheads-pruned-B1.t b/tests/test-push-checkheads-pruned-B1.t
--- a/tests/test-push-checkheads-pruned-B1.t
+++ b/tests/test-push-checkheads-pruned-B1.t
@@ -68,5 +68,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B2.t b/tests/test-push-checkheads-pruned-B2.t
--- a/tests/test-push-checkheads-pruned-B2.t
+++ b/tests/test-push-checkheads-pruned-B2.t
@@ -81,5 +81,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B3.t b/tests/test-push-checkheads-pruned-B3.t
--- a/tests/test-push-checkheads-pruned-B3.t
+++ b/tests/test-push-checkheads-pruned-B3.t
@@ -81,6 +81,7 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
 
diff --git a/tests/test-push-checkheads-pruned-B4.t b/tests/test-push-checkheads-pruned-B4.t
--- a/tests/test-push-checkheads-pruned-B4.t
+++ b/tests/test-push-checkheads-pruned-B4.t
@@ -82,5 +82,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B5.t b/tests/test-push-checkheads-pruned-B5.t
--- a/tests/test-push-checkheads-pruned-B5.t
+++ b/tests/test-push-checkheads-pruned-B5.t
@@ -88,5 +88,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   3 new obsolescence markers
+  obsoleted 3 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B6.t b/tests/test-push-checkheads-pruned-B6.t
--- a/tests/test-push-checkheads-pruned-B6.t
+++ b/tests/test-push-checkheads-pruned-B6.t
@@ -74,5 +74,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B7.t b/tests/test-push-checkheads-pruned-B7.t
--- a/tests/test-push-checkheads-pruned-B7.t
+++ b/tests/test-push-checkheads-pruned-B7.t
@@ -73,5 +73,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-pruned-B8.t b/tests/test-push-checkheads-pruned-B8.t
--- a/tests/test-push-checkheads-pruned-B8.t
+++ b/tests/test-push-checkheads-pruned-B8.t
@@ -94,5 +94,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   4 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A1.t b/tests/test-push-checkheads-superceed-A1.t
--- a/tests/test-push-checkheads-superceed-A1.t
+++ b/tests/test-push-checkheads-superceed-A1.t
@@ -65,5 +65,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A2.t b/tests/test-push-checkheads-superceed-A2.t
--- a/tests/test-push-checkheads-superceed-A2.t
+++ b/tests/test-push-checkheads-superceed-A2.t
@@ -83,5 +83,6 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A3.t b/tests/test-push-checkheads-superceed-A3.t
--- a/tests/test-push-checkheads-superceed-A3.t
+++ b/tests/test-push-checkheads-superceed-A3.t
@@ -86,5 +86,6 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A4.t b/tests/test-push-checkheads-superceed-A4.t
--- a/tests/test-push-checkheads-superceed-A4.t
+++ b/tests/test-push-checkheads-superceed-A4.t
@@ -70,5 +70,6 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../../
diff --git a/tests/test-push-checkheads-superceed-A5.t b/tests/test-push-checkheads-superceed-A5.t
--- a/tests/test-push-checkheads-superceed-A5.t
+++ b/tests/test-push-checkheads-superceed-A5.t
@@ -70,6 +70,7 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
 
diff --git a/tests/test-push-checkheads-superceed-A6.t b/tests/test-push-checkheads-superceed-A6.t
--- a/tests/test-push-checkheads-superceed-A6.t
+++ b/tests/test-push-checkheads-superceed-A6.t
@@ -94,5 +94,6 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A7.t b/tests/test-push-checkheads-superceed-A7.t
--- a/tests/test-push-checkheads-superceed-A7.t
+++ b/tests/test-push-checkheads-superceed-A7.t
@@ -94,5 +94,6 @@ Actual testing
   adding file changes
   added 2 changesets with 2 changes to 2 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 2 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-superceed-A8.t b/tests/test-push-checkheads-superceed-A8.t
--- a/tests/test-push-checkheads-superceed-A8.t
+++ b/tests/test-push-checkheads-superceed-A8.t
@@ -75,5 +75,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   2 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-unpushed-D4.t b/tests/test-push-checkheads-unpushed-D4.t
--- a/tests/test-push-checkheads-unpushed-D4.t
+++ b/tests/test-push-checkheads-unpushed-D4.t
@@ -118,5 +118,6 @@ Actual testing (existing branch only)
   adding file changes
   added 1 changesets with 1 changes to 1 files
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-unpushed-D5.t b/tests/test-push-checkheads-unpushed-D5.t
--- a/tests/test-push-checkheads-unpushed-D5.t
+++ b/tests/test-push-checkheads-unpushed-D5.t
@@ -103,5 +103,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files
   1 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-checkheads-unpushed-D7.t b/tests/test-push-checkheads-unpushed-D7.t
--- a/tests/test-push-checkheads-unpushed-D7.t
+++ b/tests/test-push-checkheads-unpushed-D7.t
@@ -92,5 +92,6 @@ Actual testing
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   3 new obsolescence markers
+  obsoleted 1 changesets
 
   $ cd ../..
diff --git a/tests/test-push-race.t b/tests/test-push-race.t
--- a/tests/test-push-race.t
+++ b/tests/test-push-race.t
@@ -1665,6 +1665,7 @@ racing commit push a new head obsoleting
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
   (run 'hg heads .' to see heads, 'hg merge' to merge)
   $ hg -R ./client-other pull
   pulling from ssh://user@dummy/server
@@ -1674,6 +1675,7 @@ racing commit push a new head obsoleting
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
   1 new obsolescence markers
+  obsoleted 1 changesets
   (run 'hg heads .' to see heads, 'hg merge' to merge)
   $ hg -R ./client-racy pull
   pulling from ssh://user@dummy/server
@@ -1770,6 +1772,7 @@ Pushing
   remote: adding file changes
   remote: added 1 changesets with 0 changes to 1 files (+1 heads)
   remote: 1 new obsolescence markers
+  remote: obsoleted 1 changesets
 
   $ release $TESTTMP/watchfile