Reset DedupeIntegrations last-seen if before_send dropped the event

Author: sentrivana

sentry_sdk/client.py

@@ -606,6 +606,10 @@ def _prepare_event(
                     self.transport.record_lost_event(
                         "before_send", data_category="error"
                     )
+                from sentry_sdk.integrations.dedupe import DedupeIntegration
+
+                DedupeIntegration.reset_last_seen()
+
             event = new_event
 
         before_send_transaction = self.options["before_send_transaction"]

sentry_sdk/integrations/dedupe.py

@@ -40,3 +40,11 @@ def processor(event, hint):
                 return None
             integration._last_seen.set(exc)
             return event
+
+    @staticmethod
+    def reset_last_seen():
+        integration = sentry_sdk.get_client().get_integration(DedupeIntegration)
+        if integration is None:
+            return
+
+        integration._last_seen.set(None)