Improve ipvs input error strings and logging (#6530)

plugins/common/logrus/hook.go

@@ -0,0 +1,35 @@
+package logrus
+
+import (
+	"io/ioutil"
+	"log"
+	"strings"
+	"sync"
+
+	"github.com/sirupsen/logrus"
+)
+
+var once sync.Once
+
+type LogHook struct {
+}
+
+// Install a logging hook into the logrus standard logger, diverting all logs
+// through the Telegraf logger at debug level.  This is useful for libraries
+// that directly log to the logrus system without providing an override method.
+func InstallHook() {
+	once.Do(func() {
+		logrus.SetOutput(ioutil.Discard)
+		logrus.AddHook(&LogHook{})
+	})
+}
+
+func (h *LogHook) Fire(entry *logrus.Entry) error {
+	msg := strings.ReplaceAll(entry.Message, "\n", " ")
+	log.Print("D! [logrus] ", msg)
+	return nil
+}
+
+func (h *LogHook) Levels() []logrus.Level {
+	return logrus.AllLevels
+}