This section should be part of RemotePolicy. Or maybe you can just use:

'product_versions': SafeYAMLList(str, optional=True, default=['*']),

Can you also change the examples in documentation? (I.e. remove the product_versions there.)

This section should be part of RemotePolicy. Or maybe you can just use:
'product_versions': SafeYAMLList(str, optional=True, default=['*']),

I've tried to make it multiple ways and it's not working.
So, let's keep it as it is.

Can you also change the examples in documentation? (I.e. remove the product_versions there.)

Add a couple of sentences to docs.

This section should be part of RemotePolicy. Or maybe you can just use:
'product_versions': SafeYAMLList(str, optional=True, default=['*']),

I've tried to make it multiple ways and it's not working.
So, let's keep it as it is.

Oh, it's because SafeYAMLList doesn't support default argument. Can you add it?

Setting default product_versions value really shouldn't be handled outside the RemotePolicy class, it would lead to inconsistencies.

This section should be part of RemotePolicy. Or maybe you can just use:
'product_versions': SafeYAMLList(str, optional=True, default=['*']),

I've tried to make it multiple ways and it's not working.
So, let's keep it as it is.

Oh, it's because SafeYAMLList doesn't support default argument. Can you add it?
Setting default product_versions value really shouldn't be handled outside the RemotePolicy class, it would lead to inconsistencies.

I've tried it, I've even tried to create a subclass just for a product version, but it's not working.

"values from the global policy will be used."

But more importantly, if gating.yaml defines product versions, then it will be used for matching.

I've tried it, I've even tried to create a subclass just for a product version, but it's not working.

You need to add default argument to constructor of SafeYAMLList in "greenwave/safe_yaml.py" and return the value in the default_value() method. Is that what you have tried?

But more importantly, if gating.yaml defines product versions, then it will be used for matching.

It's said there. Or do you mean that settings from gating.yaml supposed to override the global policy? Because now it only works when it's matched.

Please review now

You can avoid creating list and use just iterator (i.e. remove the brackets).

+1