Update azure error messages when no resources are found (elastic#14327)

* Limit error messages to log only

* Changelog update

* Update comments

CHANGELOG.next.asciidoc

@@ -238,6 +238,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Change kubernetes.event.message to text. {pull}13964[13964]
 - Fix performance counter values for windows/perfmon metricset. {issue}14036[14036] {pull}14039[14039]
 - Add FailOnRequired when applying schema and fix metric names in mongodb metrics metricset. {pull}14143[14143]
+- Limit some of the error messages to the logs only {issue}14317[14317] {pull}14327[14327]
 - Convert indexed ms-since-epoch timestamp fields in `elasticsearch/ml_job` metricset to ints from float64s. {issue}14220[14220] {pull}14222[14222]
 - Fix ARN parsing function to work for ELB ARNs. {pull}14316[14316]
 

x-pack/metricbeat/module/azure/azure.go

@@ -121,6 +121,10 @@ func (m *MetricSet) Fetch(report mb.ReporterV2) error {
 	if err != nil {
 		return err
 	}
+	if len(m.Client.Resources.Metrics) == 0 {
+		// error message is previously logged in the InitResources, no error event should be created
+		return nil
+	}
 	// retrieve metrics
 	err = m.Client.GetMetricValues(report)
 	if err != nil {

x-pack/metricbeat/module/azure/client.go

@@ -65,7 +65,7 @@ func (client *Client) InitResources(fn mapMetric, report mb.ReporterV2) error {
 		if len(resourceList.Values()) == 0 {
 			err = errors.Errorf("failed to retrieve resources: No resources returned using the configuration options resource ID %s, resource group %s, resource type %s, resource query %s",
 				resource.ID, resource.Group, resource.Type, resource.Query)
-			client.LogError(report, err)
+			client.Log.Error(err)
 			continue
 		}
 		for _, res := range resourceList.Values() {
@@ -78,10 +78,10 @@ func (client *Client) InitResources(fn mapMetric, report mb.ReporterV2) error {
 			}
 		}
 	}
-	// users could add or remove resources while metricbeat is running so we could encounter the situation where resources are unavailable, we log and create an event if this is the case (see above)
-	// but we return an error when absolutely no resources are found
+	// users could add or remove resources while metricbeat is running so we could encounter the situation where resources are unavailable we log an error message (see above)
+	// we also log a debug message when absolutely no resources are found
 	if len(metrics) == 0 {
-		return errors.New("no resources were found based on all the configurations options entered")
+		client.Log.Debug("no resources were found based on all the configurations options entered")
 	}
 	client.Resources.Metrics = metrics
 	return nil