kacpermuda commented on code in PR #75132:
URL: https://github.com/apache/airflow/pull/75132#discussion_r4323831063


##########
airflow-core/docs/authoring-and-scheduling/loops.rst:
##########
@@ -413,3 +433,18 @@ which leave them in place. To keep later iterations, clear 
from the UI or the
 REST endpoint.
 
 Tasks you leave uncleared are not recomputed using the results of the rerun.
+
+.. _loops-trajectories:
+
+Reruns and trajectories
+-----------------------
+
+Clearing later iterations starts a new execution of the loop that replaces the 
old one from the
+iteration after the rerun gate. Each execution is a trajectory: 
``loop.trajectory`` is 1 for the

Review Comment:
   It is: the trajectory is the loop region, exposed as loop.region_id. 
loop.trajectory just numbers those regions along the fork chain (1 for the 
original). Reworded the docs to say that.



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