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This can be used to store informational messages, errors or warnings which can later be shown to the user in gst-inspect-1.0, which can be useful for plugins that expose elements dynamically based on external libraries or hardware capabilities. Status messages can then provide an indication as to why a plugin doesn't have any elements listed, for example. Plus unit test to make sure code paths are exercised a little. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3832>