Use log levels for datapoint metrics (#4335)

* Use log levels for datapoint metrics

* address review comments

* fix cyclomatic complexity

core/src/locktower.rs

@@ -1,7 +1,7 @@
 use crate::bank_forks::BankForks;
 use crate::staking_utils;
 use hashbrown::{HashMap, HashSet};
-use solana_metrics::datapoint;
+use solana_metrics::datapoint_info;
 use solana_runtime::bank::Bank;
 use solana_sdk::account::Account;
 use solana_sdk::pubkey::Pubkey;
@@ -125,7 +125,7 @@ impl Locktower {
                     vote_state.nth_recent_vote(0).map(|v| v.slot).unwrap_or(0) as i64
                 );
                 debug!("observed root {}", vote_state.root_slot.unwrap_or(0) as i64);
-                datapoint!(
+                datapoint_info!(
                     "locktower-observed",
                     (
                         "slot",
@@ -211,7 +211,7 @@ impl Locktower {
                 self.epoch_stakes.epoch
             );
             self.epoch_stakes = EpochStakes::new_from_bank(bank, &self.epoch_stakes.delegate_id);
-            datapoint!(
+            datapoint_info!(
                 "locktower-epoch",
                 ("epoch", self.epoch_stakes.epoch, i64),
                 ("self_staked", self.epoch_stakes.self_staked, i64),
@@ -223,7 +223,7 @@ impl Locktower {
     pub fn record_vote(&mut self, slot: u64) -> Option<u64> {
         let root_slot = self.lockouts.root_slot;
         self.lockouts.process_vote(&Vote { slot });
-        datapoint!(
+        datapoint_info!(
             "locktower-vote",
             ("latest", slot, i64),
             ("root", self.lockouts.root_slot.unwrap_or(0), i64)