All testnets aside from Sepolia and Goerli will be deprecated post-merge. If you are a user of Ropsten, Rinkeby or Kiln, you should plan to migrate to Goerli or Sepolia.
Rinkeby, a geth-based proof-of-authority testnet, will not transition to proof-of-stake and will be shut down in Q2/Q3 2023.
https://blog.ethereum.org/2022/06/21/testnet-deprecation/