Don't log incremental Persist times

CHANGELOG.md

@@ -4,6 +4,7 @@ The releases changes the default logging level for the Raft subsystem from `INFO
 - [PR #1607](https://github.com/rqlite/rqlite/pull/1607): Remove use of deprecated `ioutil`.
 - [PR #1608](https://github.com/rqlite/rqlite/pull/1608): Always close the FSM Snapshot.
 - [PR #1610](https://github.com/rqlite/rqlite/pull/1610): Change Raft default log level to `WARN`.
+- [PR #1611](https://github.com/rqlite/rqlite/pull/1611): Don't log incremental Raft snapshots.
 
 ## 8.16.6 (January 16th 2024)
 ### Implementation changes and bug fixes

store/fsm.go

@@ -48,7 +48,9 @@ func (f *FSMSnapshot) Persist(sink raft.SnapshotSink) (retError error) {
 		if retError == nil {
 			dur := time.Since(startT)
 			stats.Get(snapshotPersistDuration).(*expvar.Int).Set(dur.Milliseconds())
-			f.logger.Printf("persisted snapshot %s in %s", sink.ID(), time.Since(startT))
+			if f.logger != nil {
+				f.logger.Printf("persisted snapshot %s in %s", sink.ID(), dur)
+			}
 		}
 	}()
 	return f.FSMSnapshot.Persist(sink)

store/store.go

@@ -1826,13 +1826,14 @@ func (s *Store) fsmSnapshot() (fSnap raft.FSMSnapshot, retErr error) {
 	stats.Add(numSnapshots, 1)
 	dur := time.Since(startT)
 	stats.Get(snapshotCreateDuration).(*expvar.Int).Set(dur.Milliseconds())
+	fs := FSMSnapshot{
+		FSMSnapshot: fsmSnapshot,
+	}
 	if fullNeeded {
 		s.logger.Printf("%s snapshot created in %s on node ID %s", fPLog, dur, s.raftID)
+		fs.logger = s.logger
 	}
-	return &FSMSnapshot{
-		FSMSnapshot: fsmSnapshot,
-		logger:      s.logger,
-	}, nil
+	return &fs, nil
 }
 
 // fsmRestore restores the node to a previous state. The Hashicorp docs state this