diff --git a/swh/loader/core/loader.py b/swh/loader/core/loader.py
--- a/swh/loader/core/loader.py
+++ b/swh/loader/core/loader.py
@@ -336,6 +336,9 @@
              in :meth:`prepare` method.
 
         """
+        sentry_sdk.set_tag("swh.loader.origin_url", self.origin.url[0:200])
+        sentry_sdk.set_tag("swh.loader.visit_type", self.visit_type)
+
         try:
             with self.statsd_timed("pre_cleanup"):
                 self.pre_cleanup()
diff --git a/swh/loader/core/tests/conftest.py b/swh/loader/core/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/loader/core/tests/conftest.py
@@ -0,0 +1,44 @@
+# Copyright (C) 2022  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+import pytest
+import sentry_sdk
+
+
+@pytest.fixture
+def sentry_init():
+    # Inspired by
+    # https://github.com/getsentry/sentry-python/blob/1.5.9/tests/conftest.py#L168-L184
+
+    initialized = False
+
+    def inner(*a, **kw):
+        nonlocal initialized
+        assert not initialized, "already initialized"
+        initialized = True
+        hub = sentry_sdk.Hub.current
+        client = sentry_sdk.Client(*a, **kw)
+        hub.bind_client(client)
+        client.transport = TestTransport()
+
+    class TestTransport:
+        def __init__(self):
+            self.events = []
+            self.envelopes = []
+
+        def capture_event(self, event):
+            self.events.append(event)
+
+        def capture_envelope(self, envelope):
+            self.envelopes.append(envelope)
+
+    with sentry_sdk.Hub(None):
+        yield inner
+
+
+@pytest.fixture
+def sentry_events(monkeypatch, sentry_init):
+    sentry_init()
+    return sentry_sdk.Hub.current.client.transport.events
diff --git a/swh/loader/core/tests/test_loader.py b/swh/loader/core/tests/test_loader.py
--- a/swh/loader/core/tests/test_loader.py
+++ b/swh/loader/core/tests/test_loader.py
@@ -479,3 +479,22 @@
     assert result == {"status": "uneventful"}
 
     _check_load_failure(caplog, loader, NotFound, "Unknown origin!", status="not_found")
+
+
+class DummyLoaderWithError(DummyBaseLoader):
+    def prepare(self, *args, **kwargs):
+        raise Exception("error")
+
+
+class DummyDVCSLoaderWithError(DummyDVCSLoader, BaseLoader):
+    def prepare(self, *args, **kwargs):
+        raise Exception("error")
+
+
+@pytest.mark.parametrize("loader_cls", [DummyLoaderWithError, DummyDVCSLoaderWithError])
+def test_loader_sentry_tags_on_error(swh_storage, sentry_events, loader_cls):
+    loader = loader_cls(swh_storage)
+    loader.load()
+    sentry_tags = sentry_events[0]["tags"]
+    assert sentry_tags.get("swh.loader.origin_url") == ORIGIN.url
+    assert sentry_tags.get("swh.loader.visit_type") == DummyLoader.visit_type