Fixes config generator custom variable too long message

Author: LordHepipud

doc/100-General/10-Changelog.md

@@ -13,6 +13,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 
 ### Bugfixes
 
+* [#579](https://github.com/Icinga/icinga-powershell-framework/issues/579) Fixes error message during config generation with `Get-IcingaCheckCommandConfig` to make it more clear, in case the custom variables generated are too long for the Icinga Director import
 * [#603](https://github.com/Icinga/icinga-powershell-framework/issues/603) Fixes service filter to handle exclude with wildcards instead of requiring the full service name (*not* applying to the display name)
 * [#609](https://github.com/Icinga/icinga-powershell-framework/issues/609) Fixes config generator to never use `set_if = true` on Icinga 2/Icinga Director configuration
 * [#615](https://github.com/Icinga/icinga-powershell-framework/issues/615) Fixes the framework migration tasks which fails in case multiple versions of the framework are installed, printing warnings in case there is

lib/core/tools/Get-IcingaCheckCommandConfig.psm1

@@ -232,7 +232,7 @@ function Get-IcingaCheckCommandConfig()
             $IcingaCustomVariable = [string]::Format('${0}_{1}_{2}$', $PluginNameSpace, (Get-Culture).TextInfo.ToTitleCase($parameter.type.name), $parameter.Name);
 
             if ($IcingaCustomVariable.Length -gt 66) {
-                Write-IcingaConsoleError 'The argument "{0}" for the plugin "{1}" is too long. The maximum size of generated custom variables is 64 digits. Current argument size: "{2}", Name: "{3}"' -Objects $parameter.Name, $check, ($IcingaCustomVariable.Length - 2), $IcingaCustomVariable.Replace('$', '');
+                Write-IcingaConsoleError 'The generated custom variable name for the argument "{0}" and plugin "{1}" is too long. Custom variables are generated by combining the check function name, the datatype of the argument as well as the argument name itself. Please shorten your argument name and/or the check function name. The maximum size of generated custom variables is 64 digits. Current argument size: "{2}", generated custom variable name: "{3}"' -Objects $parameter.Name, $check, ($IcingaCustomVariable.Length - 2), $IcingaCustomVariable.Replace('$', '');
                 return;
             }