kv: use max timestamp during below-Raft scan to gossip liveness

This commit switches `MaybeGossipNodeLivenessRaftMuLocked` to evaluate its scan
at the maximum timestamp instead of at the local node's HLC time. This ensures
that we gossip the most recent liveness record, regardless of what timestamp it
is written at.

pkg/kv/kvserver/replica_gossip.go

@@ -19,6 +19,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/kv/kvserver/uncertainty"
 	"github.com/cockroachdb/cockroach/pkg/roachpb"
 	"github.com/cockroachdb/cockroach/pkg/storage"
+	"github.com/cockroachdb/cockroach/pkg/util/hlc"
 	"github.com/cockroachdb/cockroach/pkg/util/log"
 	"github.com/cockroachdb/errors"
 )
@@ -83,7 +84,9 @@ func (r *Replica) MaybeGossipNodeLivenessRaftMuLocked(
 	}
 
 	ba := roachpb.BatchRequest{}
-	ba.Timestamp = r.store.Clock().Now()
+	// Read at the maximum timestamp to ensure that we see the most recent
+	// liveness record, regardless of what timestamp it is written at.
+	ba.Timestamp = hlc.MaxTimestamp
 	ba.Add(&roachpb.ScanRequest{RequestHeader: roachpb.RequestHeaderFromSpan(span)})
 	// Call evaluateBatch instead of Send to avoid reacquiring latches.
 	rec := NewReplicaEvalContext(