Apply topic filter to partitions metrics in burrow input (#6070)

plugins/inputs/burrow/burrow.go

@@ -432,6 +432,9 @@ func (b *burrow) genGroupStatusMetrics(r *apiResponse, cluster, group string, ac
 
 func (b *burrow) genGroupLagMetrics(r *apiResponse, cluster, group string, acc telegraf.Accumulator) {
 	for _, partition := range r.Status.Partitions {
+		if !b.filterTopics.Match(partition.Topic) {
+			continue
+		}
 		acc.AddFields(
 			"burrow_partition",
 			map[string]interface{}{

plugins/inputs/burrow/burrow_test.go

@@ -262,7 +262,7 @@ func TestFilterGroups(t *testing.T) {
 	acc := &testutil.Accumulator{}
 	plugin.Gather(acc)
 
-	require.Exactly(t, 4, len(acc.Metrics))
+	require.Exactly(t, 1, len(acc.Metrics))
 	require.Empty(t, acc.Errors)
 }