[Bug 213701] sysutils/munin-node haproxy_ng plugin gives lots of "returned no data for label" errors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213701

            Bug ID: 213701
           Summary: sysutils/munin-node haproxy_ng plugin gives lots of
                    "returned no data for label" errors
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: mat at FreeBSD.org
          Reporter: stdin at niklaas.eu
          Assignee: mat at FreeBSD.org
             Flags: maintainer-feedback?(mat at FreeBSD.org)

Created attachment 176058
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=176058&action=edit
Screenshot of missing graphs

Using the haproxy_ng plugin I encounter a lot of the following errors:

2016/10/22 12:55:12 [WARNING] Service HAPSessionsBack.mysql-write-backend on
box-hlm-03/10.3.0.1:4949 returned no data for label mysql2

Consequently a lot of graphs are not shown, such as:

* Bandwidth usage by Backend
* Bandwidth usage by Frontend
* Response errors by backend
* Session rate by backend
* Uptime by servers

The only resource related to the issue I found is an abandoned issue on GitHub:

https://github.com/munin-monitoring/contrib/issues/294

I attached a screenshot. I will attach a log of all the errors.

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