Python plugin template does not create valid module configuration

[Slabimic]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 6.18
• Ruby: 2.6.2-118
• Distribution: Centos 7.9
• Module version: 12.2.1-rc0

How to reproduce (e.g Puppet code you use)

Create python plugin module configuration eg.

collectd::plugin::python::module {
  'haproxy':
     config  => [
       { 
         'Verbose'      => $verbose_logging,
         'ProxyMonitor' => $proxy_monitor,
         'ProxyIgnore'  => $proxy_ignore,
         'Socket'       => $socket,
       }
     ],

Using the https://github.com/mleinart/collectd-haproxy as a module for python plugin.

What are you seeing

The generated configuration (more values assigned to the key on a single line separated by space) eg.

ProxyMonitor "frontend" "backend" "server"

is not compatible with collectd register_config function using the Config object where it is written.

The sequence of children keeps one entry for each configuration option.
-- https://collectd.org/documentation/manpages/collectd-python.5.shtml#config

So the array for values of module key cannot be formed like that as it is not propagated to the module by collectd itself.

What behaviour did you expect instead

The single value per module configuration key is expected, so the result is supposed to be like.

ProxyMonitor "frontend"
ProxyMonitor "backend"
ProxyMonitor "server"

Any additional information you'd like to impart

The affected part of the code is https://github.com/voxpupuli/puppet-collectd/blob/master/templates/plugin/python/module.conf_config.epp#L11-L21