diff --git a/plugins/inputs/oceanbase/log/error_log_input.go b/plugins/inputs/oceanbase/log/error_log_input.go
index d28867ec993cb2e45cb8826feffcde6267fd1855..fef92c5229f5ff914538618d57c196889bd956ad 100644
--- a/plugins/inputs/oceanbase/log/error_log_input.go
+++ b/plugins/inputs/oceanbase/log/error_log_input.go
@@ -79,12 +79,13 @@ type Config struct {
 }
 
 type ErrorLogInput struct {
-	config           *Config
-	logAnalyzer      ILogAnalyzer
-	logProcessQueue  map[ServiceType]*processQueue
-	ctx              context.Context
-	cancel           context.CancelFunc
-	metricBufferChan chan []metric.Metric
+	config                   *Config
+	logAnalyzer              ILogAnalyzer
+	logProcessQueue          map[ServiceType]*processQueue
+	ctx                      context.Context
+	cancel                   context.CancelFunc
+	tbackgroundTaskWaitGroup sync.WaitGroup
+	metricBufferChan         chan []metric.Metric
 }
 
 func (e *ErrorLogInput) SampleConfig() string {
@@ -123,10 +124,12 @@ func (e *ErrorLogInput) Init(config map[string]interface{}) error {
 	}
 
 	for service := range e.config.LogServiceConfig {
+		e.backgroundTaskWaitGroup.Add(1)
 		go e.doCollect(service)
 	}
 
 	// start go routine to add log file to logProcessQueue
+	e.backgroundTaskWaitGroup.Add(1)
 	go e.watchFile()
 
 	log.Info("error log input init with config", e.config)
@@ -135,6 +138,7 @@ func (e *ErrorLogInput) Init(config map[string]interface{}) error {
 }
 
 func (e *ErrorLogInput) doCollect(service ServiceType) {
+	defer e.backgroundTaskWaitGroup.Done()
 	for {
 		select {
 		case <-e.ctx.Done():
@@ -221,7 +225,6 @@ func (e *ErrorLogInput) processLogLine(service ServiceType, line string) metric.
 }
 
 func (e *ErrorLogInput) isFiltered(service ServiceType, line string) bool {
-	// TODO: compile first
 	c, found := e.config.LogServiceConfig[service]
 	if found {
 		if c.ExcludeRegexes == nil {
@@ -238,6 +241,7 @@ func (e *ErrorLogInput) isFiltered(service ServiceType, line string) bool {
 }
 
 func (e *ErrorLogInput) watchFile() {
+	defer e.backgroundTaskWaitGroup.Done()
 	for {
 		select {
 		case <-e.ctx.Done():
@@ -297,7 +301,6 @@ func (e *ErrorLogInput) watchFileChanges() {
 					fileDesc:  newFileDesc,
 					isRenamed: false,
 				})
-				// TODO: should set all node renamed except last one
 				queue.setRenameTrueExceptTail()
 			}
 		} else {
@@ -315,6 +318,7 @@ func (e *ErrorLogInput) watchFileChanges() {
 
 func (e *ErrorLogInput) Close() error {
 	e.cancel()
+	e.backgroundTaskWaitGroup.Wait()
 	return nil
 }
 
diff --git a/plugins/outputs/prometheus/alertmanager.go b/plugins/outputs/prometheus/alertmanager.go
index 2dd74244cd60dbb92fc52bd0e3a7b71b5127229b..62520e14ced30e57135dfc3dc387e28ca81c0937 100644
--- a/plugins/outputs/prometheus/alertmanager.go
+++ b/plugins/outputs/prometheus/alertmanager.go
@@ -19,11 +19,11 @@ import (
 	"fmt"
 	"math/rand"
 	"net/http"
+	"sync"
 	"time"
 
 	"github.com/pkg/errors"
 
-	// "github.com/avast/retry-go/v3"
 	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v3"
 
@@ -51,11 +51,12 @@ type AlertmanagerOutputConfig struct {
 }
 
 type AlertmanagerOutput struct {
-	config     *AlertmanagerOutputConfig
-	httpClient *http.Client
-	taskChan   chan []metric.Metric
-	ctx        context.Context
-	cancelFunc context.CancelFunc
+	config                  *AlertmanagerOutputConfig
+	httpClient              *http.Client
+	taskChan                chan []metric.Metric
+	ctx                     context.Context
+	cancelFunc              context.CancelFunc
+	backgroundTaskWaitGroup sync.WaitGroup
 }
 
 func (a *AlertmanagerOutput) Init(config map[string]interface{}) error {
@@ -79,6 +80,7 @@ func (a *AlertmanagerOutput) Init(config map[string]interface{}) error {
 		a.httpClient.Timeout = a.config.HttpTimeout
 	}
 
+	a.backgroundTaskWaitGroup.Add(1)
 	go a.schedule()
 
 	log.Infof("alertmanager output inited with config : %v", a.config)
@@ -88,6 +90,7 @@ func (a *AlertmanagerOutput) Init(config map[string]interface{}) error {
 func (a *AlertmanagerOutput) Close() error {
 	a.cancelFunc()
 	close(a.taskChan)
+	a.backgroundTaskWaitGroup.Wait()
 	return nil
 }
 
@@ -112,6 +115,7 @@ func (a *AlertmanagerOutput) Write(metrics []metric.Metric) error {
 }
 
 func (a *AlertmanagerOutput) schedule() {
+	a.backgroundTaskWaitGroup.Done()
 	for {
 		select {
 		case <-a.ctx.Done():