No, it does not have to be unique. Whether it’s a good practice to use it this way – that’s another question you can ask that plugin authors. Here’s the scenario:
- you have a slider in an entry
- slider has several slides
- each slide is stored as meta
In this case, you will have couple records with the same post_ID and same meta_key (let’s call it ‘slide’). You can fetch them with get_post_meta( $post->ID, 'slide' ) into an array.
Personally, I would store all slides in a single meta as a serialized array. But I do see some use cases for storing repeatable data in separate meta records. For example, you might need to treat it meta_value_num in you meta_query, which will not work with serialized array data.
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