Ignore errors serializing single metrics (#5943)

plugins/outputs/socket_writer/socket_writer.go

@@ -1,13 +1,12 @@
 package socket_writer
 
 import (
+	"crypto/tls"
 	"fmt"
 	"log"
 	"net"
 	"strings"
 
-	"crypto/tls"
-
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
 	tlsint "github.com/influxdata/telegraf/internal/tls"
@@ -128,8 +127,8 @@ func (sw *SocketWriter) Write(metrics []telegraf.Metric) error {
 	for _, m := range metrics {
 		bs, err := sw.Serialize(m)
 		if err != nil {
-			//TODO log & keep going with remaining metrics
-			return err
+			log.Printf("D! [outputs.socket_writer] Could not serialize metric: %v", err)
+			continue
 		}
 		if _, err := sw.Conn.Write(bs); err != nil {
 			//TODO log & keep going with remaining strings