diff --git a/plugins/docker/rekey.py b/plugins/docker/rekey.py
index 3fe0b1d..8d1a2a2 100644
--- a/plugins/docker/rekey.py
+++ b/plugins/docker/rekey.py
@@ -13,6 +13,7 @@ from __future__ import annotations
 import asyncio
 import logging
 import time
+from collections import Counter
 from typing import TYPE_CHECKING
 
 from sqlalchemy import delete, select, text, update
@@ -90,6 +91,9 @@ async def old_keys(session) -> list[str]:
              | await names(MaintenanceWindow.scope_resource, MaintenanceWindow.scope_source == "docker"))
     logger.info("Swarm history under task names: %d keys with raw samples, %d with hourly rows, "
                 "%d named by anomalies, rules or windows", len(recent), len(hourly), len(named))
+    by_service = Counter(task_service(k.split("/", 1)[1]) for k in hourly - recent)
+    logger.info("Swarm history under task names, hourly only, most keys first: %s; for example %s",
+                by_service.most_common(10), sorted(hourly - recent)[:3])
     return sorted(hourly - recent) + sorted((named - hourly) - recent) + sorted(recent)