Describe the bug
services.munin-node is broken (cannot start). It seems due to a perl change in v5.30.

Ref.
munin-monitoring/munin#1202
https://rt.perl.org/Public/Bug/Display.html?id=134194
Perl/perl5@15dbe1a

To Reproduce

  services = {
    munin-node.enable = true;

    munin-cron = {
      enable = true;
      hosts = ''
        [${config.networking.hostName}]
        address localhost
      '';
    };
  };

After activating the configuration, systemctl --failed shows munin-node.service in failed status.

Expected behavior
Munin would generate some plugins in /etc/munin/plugins and munin-node.service should be working.

Metadata
NixOS 19.09 (regression from 19.03).