diff -r 111f5a0cbcaa -r 568f63b5a30f mercurial/requirements.py
--- a/mercurial/requirements.py	Mon Jan 31 14:26:35 2022 +0100
+++ b/mercurial/requirements.py	Mon Jan 31 08:44:48 2022 +0100
@@ -18,6 +18,7 @@
 STORE_REQUIREMENT = b'store'
 FNCACHE_REQUIREMENT = b'fncache'
 
+DIRSTATE_TRACKED_KEY_V1 = b'exp-dirstate-tracked-key-v1'
 DIRSTATE_V2_REQUIREMENT = b'dirstate-v2'
 
 # When narrowing is finalized and no longer subject to format changes,
@@ -96,6 +97,7 @@
     SHARED_REQUIREMENT,
     RELATIVE_SHARED_REQUIREMENT,
     SHARESAFE_REQUIREMENT,
+    DIRSTATE_TRACKED_KEY_V1,
     DIRSTATE_V2_REQUIREMENT,
 }