diff --git a/core/plugin/flusher/sls/FlusherSLS.cpp b/core/plugin/flusher/sls/FlusherSLS.cpp
index a236c6ec61..faa9b7f7c7 100644
--- a/core/plugin/flusher/sls/FlusherSLS.cpp
+++ b/core/plugin/flusher/sls/FlusherSLS.cpp
@@ -652,7 +652,7 @@ bool FlusherSLS::BuildRequest(SenderQueueItem* item, unique_ptr<HttpSinkRequest>
     }
     if (data->mCurrentHost.empty()) {
         if (mCandidateHostsInfo->IsInitialized()) {
-            GetRegionConcurrencyLimiter(mRegion)->OnFail();
+            GetRegionConcurrencyLimiter(mRegion)->OnFail(chrono::system_clock::now());
         }
         *errMsg = "failed to get available host";
         *keepItem = true;
diff --git a/core/unittest/models/MetricEventUnittest.cpp b/core/unittest/models/MetricEventUnittest.cpp
index ada8af3239..b148cce39b 100644
--- a/core/unittest/models/MetricEventUnittest.cpp
+++ b/core/unittest/models/MetricEventUnittest.cpp
@@ -346,7 +346,7 @@ void MetricEventUnittest::TestTagsIterator() {
 void MetricEventUnittest::TestCopy() {
     MetricEvent* oldMetricEvent = mEventGroup->AddMetricEvent();
     oldMetricEvent->SetValue(map<StringView, double>{{"test-1", 10.0}, {"test-2", 2.0}});
-    APSARA_TEST_EQUAL(1, mEventGroup->GetEvents().size());
+    APSARA_TEST_EQUAL(1U, mEventGroup->GetEvents().size());
 
     PipelineEventGroup newGroup = mEventGroup->Copy();
     MetricEvent newMetricEvent = newGroup.GetEvents().at(0).Cast<MetricEvent>();