Add more info to logstash TestXPackEnabled test (elastic#24823)

This test seems to be flaky, but is difficult to reproduce locally.
Reduce the use of requirements and separate metricsets in different
tests so more assertions are executed. Print also the problematic event
to have more information next time it happens.

metricbeat/module/logstash/logstash_integration_test.go

@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/elastic/beats/v7/libbeat/tests/compose"
@@ -84,14 +85,20 @@ func TestXPackEnabled(t *testing.T) {
 	config := getXPackConfig(lsService.Host())
 	metricSets := mbtest.NewReportingMetricSetV2Errors(t, config)
 	for _, metricSet := range metricSets {
-		events, errs := mbtest.ReportingFetchV2Error(metricSet)
-		require.Empty(t, errs)
-		require.NotEmpty(t, events)
-
-		event := events[0]
-		require.Equal(t, metricSetToTypeMap[metricSet.Name()], event.RootFields["type"])
-		require.Equal(t, clusterUUID, event.RootFields["cluster_uuid"])
-		require.Regexp(t, `^.monitoring-logstash-\d-mb`, event.Index)
+		t.Run(metricSet.Name(), func(t *testing.T) {
+			events, errs := mbtest.ReportingFetchV2Error(metricSet)
+			require.Empty(t, errs)
+			require.NotEmpty(t, events)
+
+			event := events[0]
+			assert.Equal(t, metricSetToTypeMap[metricSet.Name()], event.RootFields["type"])
+			assert.Equal(t, clusterUUID, event.RootFields["cluster_uuid"])
+			assert.Regexp(t, `^.monitoring-logstash-\d-mb`, event.Index)
+
+			if t.Failed() {
+				t.Logf("event: %+v", event)
+			}
+		})
 	}
 }