Splunk Add-on Builder: Custom inputs.conf configuration option

[MichaelMcAleer]

Hi Splunk Community,

I am building a Python modular input using the Splunk add-on builder tool and I want to add a custom configuration option 'performance_custom_metrics' which is optional and set only in inputs.conf, not via the data input UI configuration defined when building the add-on.

Everything seems fine for the most part, but when I try to add a new data input I get the following error about the optional config option:

The following required arguments are missing: performance_custom_metrics

 Because performance_custom_metrics is not defined in the add-on UI configuration I am not allowed to create inputs via the UI. Only manual creation via inputs.conf works as expected.

I've set required_on_create and required_on_edit both to False when defining the argument in inputs.py:

scheme.add_argument(smi.Argument(
    'performance_custom_metrics', required_on_create=False,
    required_on_edit=False))

From solnlib/packages/splunklib/modularinput/argument.py #60:

:param required_on_edit: ``Boolean``, whether this arg is required when editing an existing modular input of this kind.
:param required_on_create: ``Boolean``, whether this arg is required when creating a modular input of this kind.

Has anyone any idea what other option I need to set to make performance_custom_metrics an optional input parameter for my add-on?