exec input documentation needs modernization

[danielnelson]

Bug report

The documentation for the exec should be updated:

• use the latest example template
• remove incorrect information about JSON format
• provide information about exit codes
• add hint about permissions 2017-04-25T18:09:30Z E! ERROR in input [inputs.exec]: Errors encountered: [metric parsing error, reason: [buffer too short], buffer: [], index: [0]] #2718
• signals?

System info:

c66e289

[mjesse88]

Hi danielnelson,

About remove incorrect information about JSON format:
It whether that when the script output empty json?

In version V1.3.0,
sometime I don't need metrics write to influxdb, so my script output empty json,

the telegraf write error to log file,see below my test script:

1. test.bat
   @echo off
   exit /b 0
   E! Error in plugin [inputs.exec]: unable to parse out as JSON, unexpected end of JSON input

2.test.bat
@echo off
echo ""
exit /b 0
E! Error in plugin [inputs.exec]: unable to parse out as JSON, json: cannot unmarshal string into Go value of type map[string]interface {}

BTW
I Know the data format is influx. the warning or error is removed by devoloper.

thanks
Jesse

[danielnelson]

@mjesse88 I opened #2887 for this.

[danielnelson]

Closed in ab8376d