From 390c4d4afbe43435bf1b48821695c79f2c008b26 Mon Sep 17 00:00:00 2001
From: Calle Pettersson <calle@cape.nu>
Date: Thu, 27 Aug 2020 18:49:09 +0200
Subject: [PATCH] Add a counter for empty syslog messages

---
 pkg/promtail/targets/syslog/syslogtarget.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkg/promtail/targets/syslog/syslogtarget.go b/pkg/promtail/targets/syslog/syslogtarget.go
index 4e5be435a8ba..d92e001ac8fc 100644
--- a/pkg/promtail/targets/syslog/syslogtarget.go
+++ b/pkg/promtail/targets/syslog/syslogtarget.go
@@ -38,6 +38,11 @@ var (
 		Name:      "syslog_target_parsing_errors_total",
 		Help:      "Total number of parsing errors while receiving syslog messages",
 	})
+	syslogEmptyMessages = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: "promtail",
+		Name:      "syslog_empty_messages_total",
+		Help:      "Total number of empty messages receiving from syslog",
+	})
 
 	defaultIdleTimeout = 120 * time.Second
 )
@@ -181,6 +186,7 @@ func (t *SyslogTarget) handleMessage(connLabels labels.Labels, msg syslog.Messag
 	rfc5424Msg := msg.(*rfc5424.SyslogMessage)
 
 	if rfc5424Msg.Message == nil {
+		syslogEmptyMessages.Inc()
 		return
 	}