Index: cloud_sync.py
===================================================================
diff -u -r79dadd7422855193f345beced530c6b92fc49b3a -r8dda975c3b3303764304ed174177c22bbf0f6367
--- cloud_sync.py	(.../cloud_sync.py)	(revision 79dadd7422855193f345beced530c6b92fc49b3a)
+++ cloud_sync.py	(.../cloud_sync.py)	(revision 8dda975c3b3303764304ed174177c22bbf0f6367)
@@ -150,11 +150,15 @@
     # Heartbeat gets the idempotent lane + g_config so it can drain
     # rotated CS-log files one-per-tick when that lane is idle. Registration
     # mode sets send_heartbeat=False below, so opportunistic CS-log upload
-    # stays inert during registration.
+    # stays inert during registration. log_handler drives the silent-day
+    # force-rotate path so devices that don't emit (e.g. logLevel=ERROR
+    # with no errors) still produce one rotated file per UTC day for the
+    # opportunistic upload step above to send.
     heartbeat_provider = HeartBeatProvider(logger=app.logger, network_request_handler=network_request_handler,
                                            output_channel=output_channel,
                                            idempotent_network_request_handler=idempotent_network_request_handler,
-                                           g_config=g_config)
+                                           g_config=g_config,
+                                           log_handler=logconf.log_handler)
 
     # CS-log uploads (SEND_CS_LOG) go through the idempotent lane.
     logconf.set_network_provider(network_request_handler=idempotent_network_request_handler)