Skip unserializable metric in influxDB UDP output (#4534)

plugins/serializers/influx/influx_test.go

@@ -23,7 +23,7 @@ var tests = []struct {
 	typeSupport FieldTypeSupport
 	input       telegraf.Metric
 	output      []byte
-	err         error
+	errReason   string
 }{
 	{
 		name: "minimal",
@@ -98,7 +98,7 @@ var tests = []struct {
 				time.Unix(0, 0),
 			),
 		),
-		err: ErrNoFields,
+		errReason: NoFields,
 	},
 	{
 		name: "float Inf",
@@ -333,8 +333,8 @@ var tests = []struct {
 				time.Unix(1519194109, 42),
 			),
 		),
-		output: nil,
-		err:    ErrNeedMoreSpace,
+		output:    nil,
+		errReason: NeedMoreSpace,
 	},
 	{
 		name: "no fields",
@@ -346,7 +346,7 @@ var tests = []struct {
 				time.Unix(0, 0),
 			),
 		),
-		err: ErrNoFields,
+		errReason: NoFields,
 	},
 	{
 		name: "procstat",
@@ -427,7 +427,10 @@ func TestSerializer(t *testing.T) {
 			serializer.SetFieldSortOrder(SortFields)
 			serializer.SetFieldTypeSupport(tt.typeSupport)
 			output, err := serializer.Serialize(tt.input)
-			require.Equal(t, tt.err, err)
+			if tt.errReason != "" {
+				require.Error(t, err)
+				require.Contains(t, err.Error(), tt.errReason)
+			}
 			require.Equal(t, string(tt.output), string(output))
 		})
 	}