Failed to resolve module stream in dnf module

CentOS 8 delivers multiple application versions through dnf module streams provided by AppStream repositories. The dnf module command relies on module stream metadata to enable, disable, or install streams.

When the resolver cannot locate requested metadata, dnf emits 'Failed to resolve module stream'. The current message offers limited feedback about whether the module name, stream name, or context is missing, which affects accessibility of the user-facing workflow.

CentOS 8 reached end-of-life in 2021 and module streams are optional in minimal or custom installations. The unresolved decision is whether module stream support will be maintained for CentOS 8 after the shift to CentOS Stream, and whether a fallback mechanism is defined.

What diagnostic detail should be surfaced to distinguish missing name, stream, or context? Is continued module stream support for CentOS 8 defined after the CentOS Stream transition? Is a default stream fallback planned to improve accessibility?