Add metrics to vote account close feature (#25746) (#25762)

(cherry picked from commit 88299e7)

Co-authored-by: Will Hickey <will.hickey@solana.com>

programs/vote/src/vote_state/mod.rs

@@ -5,6 +5,7 @@ use {
     bincode::{deserialize, serialize_into, serialized_size, ErrorKind},
     log::*,
     serde_derive::{Deserialize, Serialize},
+    solana_metrics::datapoint_debug,
     solana_sdk::{
         account::{AccountSharedData, ReadableAccount, WritableAccount},
         account_utils::State,
@@ -933,9 +934,11 @@ pub fn withdraw<S: std::hash::BuildHasher>(
             .unwrap_or(false);
 
         if reject_active_vote_account_close {
+            datapoint_debug!("vote-account-close", ("reject-active", 1, i64));
             return Err(InstructionError::ActiveVoteAccountClose);
         } else {
             // Deinitialize upon zero-balance
+            datapoint_debug!("vote-account-close", ("allow", 1, i64));
             vote_account.set_state(&VoteStateVersions::new_current(VoteState::default()))?;
         }
     } else if let Some(rent_sysvar) = rent_sysvar {