diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -1569,6 +1569,9 @@
         return self._revlog.addgroup(deltas, linkmapper, transaction,
                                      addrevisioncb=addrevisioncb)
 
+    def rawsize(self, rev):
+        return self._revlog.rawsize(rev)
+
     def getstrippoint(self, minlink):
         return self._revlog.getstrippoint(minlink)
 
diff --git a/mercurial/repository.py b/mercurial/repository.py
--- a/mercurial/repository.py
+++ b/mercurial/repository.py
@@ -1136,6 +1136,14 @@
         See the documentation in ``ifilemutation`` for more.
         """
 
+    def rawsize(rev):
+        """Obtain the size of tracked data.
+
+        Is equivalent to ``len(m.revision(node, raw=True))``.
+
+        TODO this method is only used by upgrade code and may be removed.
+        """
+
     def getstrippoint(minlink):
         """Find minimum revision that must be stripped to strip a linkrev.