diff --git a/swh/loader/package/deposit/loader.py b/swh/loader/package/deposit/loader.py
--- a/swh/loader/package/deposit/loader.py
+++ b/swh/loader/package/deposit/loader.py
@@ -11,6 +11,7 @@
 
 import attr
 import requests
+import sentry_sdk
 
 from swh.core.config import load_from_envvar
 from swh.loader.core.loader import DEFAULT_CONFIG
@@ -241,7 +242,8 @@
         try:
             self.metadata()
         except ValueError:
-            logger.error(f"Unknown deposit {self.deposit_id}, ignoring")
+            logger.exception(f"Unknown deposit {self.deposit_id}")
+            sentry_sdk.capture_exception()
             return {"status": "failed"}
 
         # Then usual loading
@@ -289,6 +291,7 @@
             )
         except Exception:
             logger.exception("Problem when trying to update the deposit's status")
+            sentry_sdk.capture_exception()
             return {"status": "failed"}
         return r
 
@@ -343,7 +346,6 @@
             return r.json()
 
         msg = f"Problem when retrieving deposit metadata at {url}"
-        logger.error(msg)
         raise ValueError(msg)
 
     def status_update(
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
@@ -335,9 +335,17 @@
                 )
             }
             if missing_releases:
-                logger.error(
-                    "Found ExtIDs pointing to missing releases: %s", missing_releases
-                )
+
+                err_message = "Found ExtIDs pointing to missing releases"
+
+                logger.error(err_message + ": %s", missing_releases)
+
+                with sentry_sdk.push_scope() as scope:
+                    scope.set_extra(
+                        "missing_releases", [str(x) for x in missing_releases]
+                    )
+                    sentry_sdk.capture_message(err_message, "error")
+
             release_extid_targets -= missing_releases
 
             extid_target2 = self.select_extid_target(p_info, release_extid_targets)
@@ -585,6 +593,7 @@
                 errors=[str(e)],
             )
         except Exception as e:
+            sentry_sdk.capture_exception(e)
             return self.finalize_visit(
                 snapshot=snapshot,
                 visit=visit,
@@ -888,7 +897,9 @@
         # Deal with extra-branches
         for name, branch_target in extra_branches.items():
             if name in branches:
-                logger.error("Extra branch '%s' has been ignored", name)
+                error_message = f"Extra branch '{name!r}' has been ignored"
+                logger.error(error_message)
+                sentry_sdk.capture_message(error_message, "error")
             else:
                 branches[name] = branch_target