From 9c4b52256ddab66f696745d5e0a4d652e0cfe026 Mon Sep 17 00:00:00 2001
From: Max U <max.untrecht@gmail.com>
Date: Thu, 21 Jun 2018 13:13:46 -0700
Subject: [PATCH] tweak metric output

---
 plugins/inputs/reader/reader.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugins/inputs/reader/reader.go b/plugins/inputs/reader/reader.go
index a8bf5c468..274f22a66 100644
--- a/plugins/inputs/reader/reader.go
+++ b/plugins/inputs/reader/reader.go
@@ -59,6 +59,10 @@ func (r *Reader) Gather(acc telegraf.Accumulator) error {
 }
 
 func (r *Reader) compileParser() {
+	if r.DataFormat == "" {
+		log.Printf("E! No data_format specified")
+		return
+	}
 	if r.DataFormat == "grok" {
 		log.Printf("Grok isn't supported yet")
 		return