Add GetMinimumDelegation stake program instruction (#24020)

sdk/program/src/stake/instruction.rs

@@ -222,6 +222,15 @@ pub enum StakeInstruction {
     ///   1. `[SIGNER]` Lockup authority or withdraw authority
     ///   2. Optional: `[SIGNER]` New lockup authority
     SetLockupChecked(LockupCheckedArgs),
+
+    /// Get the minimum stake delegation, in lamports
+    ///
+    /// # Account references
+    ///   None
+    ///
+    /// The minimum delegation will be returned via the transaction context's returndata.
+    /// Use `get_return_data()` to retrieve the result.
+    GetMinimumDelegation,
 }
 
 #[derive(Default, Debug, Serialize, Deserialize, PartialEq, Clone, Copy)]
@@ -678,6 +687,14 @@ pub fn set_lockup_checked(
     )
 }
 
+pub fn get_minimum_delegation() -> Instruction {
+    Instruction::new_with_bincode(
+        id(),
+        &StakeInstruction::GetMinimumDelegation,
+        Vec::default(),
+    )
+}
+
 #[cfg(test)]
 mod tests {
     use {super::*, crate::instruction::InstructionError};

sdk/program/src/stake/mod.rs

@@ -6,7 +6,8 @@ pub mod program {
     crate::declare_id!("Stake11111111111111111111111111111111111111");
 }
 
-/// The minimum stake amount that can be delegated, in lamports.
-/// NOTE: This is also used to calculate the minimum balance of a stake account, which is the
-/// rent exempt reserve _plus_ the minimum stake delegation.
+#[deprecated(
+    since = "1.10.6",
+    note = "This constant may be outdated, please use `solana_stake_program::get_minimum_delegation` instead"
+)]
 pub const MINIMUM_STAKE_DELEGATION: u64 = 1;