Malformed plugin output in Icinga Web 2

Hello there,

we have trouble displaying metrics from a (self developed) plugin monitoring BGP peers from FRR (

(simplified) Plugin Output

FRR OK | 'DEAD:BEEF::6_uptime'=239402;; 'DEAD:BEEF::6_state'=6;; ''=239402;; ''=6;;

While the plugins output on the command line looks fine, the performance data’s labels in Icinga Web 2 are malformed:

Screenshot 2020-10-16 at 08.23.55

We could locate the issue in the ::6 in the label of the IPv6 peer metrics.
When replacing :: with : everything looks fine.
When monitoring only IPv6 or IPv4 peer information output is normal, too.

Did we discover a bug or is this expected behaviour?
Is there a way to escape the plugin’s output?

Icinga Web 2 Version 2.8.2 (Git commit 8a89839af94a247ee2149b2336c73b8251b477c0)
# icinga2 --version
icinga2 - The Icinga 2 network monitoring daemon (version: 2.12.0-1)

Copyright (c) 2012-2020 Icinga GmbH (
License GPLv2+: GNU GPL version 2 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

System information:
  Platform: CentOS Linux
  Platform version: 7 (Core)
  Kernel: Linux
  Kernel version: 3.10.0-1127.19.1.el7.x86_64
  Architecture: x86_64

Build information:
  Compiler: GNU 4.8.5
  Build host: runner-hh8q3bz2-project-322-concurrent-0
  OpenSSL version: OpenSSL 1.0.2k-fips  26 Jan 2017


just tried this myself and took a look what Icinga Web 2 parses there and how. Because to my knowledge (double) colons are not a part of the syntax.

So I noticed that this is already what gets written to the IDO. Icinga 2 seems to mangle the performance data already so that DEAD:BEEF:: is put in front of all other perfdata labels as well.

Maybe @nhilverling can give an insight why that’s the case or if it’s even a bug?

Hi Johannes,

thank you for verifying the issue and your hint regarding IDO.
According to :: seems to be a format extension introduced for multi performance labels (cfg.

As a workaround for this issue we expand IPv6 addresses => eliminating all ::.