diff --git a/swh/loader/package/loader.py b/swh/loader/package/loader.py
--- a/swh/loader/package/loader.py
+++ b/swh/loader/package/loader.py
@@ -25,6 +25,8 @@
 import attr
 import sentry_sdk
 
+from itertools import islice
+
 from swh.core.tarball import uncompress
 from swh.core.config import SWHConfig
 from swh.model import from_disk
@@ -362,9 +364,10 @@
             if snapshot_id:
                 result["snapshot_id"] = hash_to_hex(snapshot_id)
             if failed_branches:
-                logger.warning(
-                    "%d failed branches: %s", len(failed_branches), failed_branches,
-                )
+                logger.warning("%d failed branches", len(failed_branches))
+                for urls in islice(failed_branches, 500):
+                    logger.warning("failed branches: %s", urls)
+
             return result
 
         # Prepare origin and origin_visit