[IIS] Remove beta warning from application_pool metricset

CHANGELOG.next.asciidoc

@@ -188,6 +188,7 @@ automatic splitting at root level, if root level element is an array. {pull}3415
 - Collect missing remote_cluster in elasticsearch ccr metricset {pull}34957[34957]
 - Add context with timeout in AWS API calls {pull}35425[35425]
 - Fix no error logs displayed in CloudWatch EC2, RDS and SQS metadata {issue}34985[34985] {pull}35035[35035]
+- Remove Beta warning from IIS application_pool metricset {pull}35480[35480]
 
 *Osquerybeat*
 

x-pack/metricbeat/module/iis/application_pool/application_pool.go

@@ -7,9 +7,8 @@
 package application_pool
 
 import (
-	"github.com/pkg/errors"
+	"fmt"
 
-	"github.com/elastic/beats/v7/libbeat/common/cfgwarn"
 	"github.com/elastic/beats/v7/metricbeat/mb"
 	"github.com/elastic/elastic-agent-libs/logp"
 )
@@ -40,7 +39,6 @@ type Config struct {
 // New creates a new instance of the MetricSet. New is responsible for unpacking
 // any MetricSet specific configuration options if there are any.
 func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
-	cfgwarn.Beta("The iis application_pool metricset is beta.")
 	var config Config
 	if err := base.Module().UnpackConfig(&config); err != nil {
 		return nil, err
@@ -70,12 +68,12 @@ func (m *MetricSet) Fetch(report mb.ReporterV2) error {
 	if m.reader.executed {
 		err := m.reader.initAppPools()
 		if err != nil {
-			return errors.Wrap(err, "failed retrieving counters")
+			return fmt.Errorf("failed retrieving counters: %w", err)
 		}
 	}
 	events, err := m.reader.read()
 	if err != nil {
-		return errors.Wrap(err, "failed reading counters")
+		return fmt.Errorf("failed reading counters: %w", err)
 	}
 
 	for _, event := range events {
@@ -91,7 +89,7 @@ func (m *MetricSet) Fetch(report mb.ReporterV2) error {
 func (m *MetricSet) Close() error {
 	err := m.reader.close()
 	if err != nil {
-		return errors.Wrap(err, "failed to close pdh query")
+		return fmt.Errorf("failed to close pdh query: %w", err)
 	}
 	return nil
 }