For a rabbit with kidney issues, its important to focus on high-fiber, low-protein hay to promote kidney health and support digestive function. Oaten hay, which you were previously using, contains moderate protein. Orchard grass hay has lower protein content but is still appropriate.
Focus on grass hay (such as Timothy, Orchard, or Brome), limited amounts of low-calcium leafy greens (such as romaine lettuce or cilantro), and appropriate rabbit pellets formulated for senior rabbits or those with kidney disease.

Rabbits love to forage, so if you cant provide forage opportunities, then herbal hay is a good choice. Clover, hibiscus, lavender, rose, and elderflower are also great additions to this hay.

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Rabbits with certain health conditions, such as kidney disease or obesity, should also avoid alfalfa hay due to its high protein levels. When selecting an alfalfa hay for your rabbit, look for products that are low in protein (around 10-12%) and rich in fiber (at least 30%).

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Rabbits with pre-existing kidney issues, bladder stones, or dental problems should have their greens curated by a vet. In these cases, even seemingly safe greens may need modification to prevent complications.