diff --git a/patroni/api.py b/patroni/api.py
index d9136d24..e0a7c79c 100644
--- a/patroni/api.py
+++ b/patroni/api.py
@@ -295,7 +295,7 @@ class RestApiHandler(BaseHTTPRequestHandler):
         cluster = patroni.dcs.cluster
         config = global_config.from_cluster(cluster)
 
-        leader_optime = cluster and cluster.last_lsn or 0
+        leader_optime = cluster and cluster.status.last_lsn
         replayed_location = response.get('xlog', {}).get('replayed_location', 0)
         max_replica_lag = parse_int(self.path_query.get('lag', [sys.maxsize])[0], 'B')
         if max_replica_lag is None:
diff --git a/patroni/dcs/__init__.py b/patroni/dcs/__init__.py
index 33a39464..4253ecc7 100644
--- a/patroni/dcs/__init__.py
+++ b/patroni/dcs/__init__.py
@@ -738,6 +738,13 @@ class Status(NamedTuple):
         """
         return Status(0, None)
 
+    def is_empty(self):
+        """Validate definition of all attributes of this :class:`Status` instance.
+
+        :returns: ``True`` if all attributes of the current :class:`Status` are unpopulated.
+        """
+        return self.last_lsn == 0 and self.slots is None
+
     @staticmethod
     def from_node(value: Union[str, Dict[str, Any], None]) -> 'Status':
         """Factory method to parse *value* as :class:`Status` object.
@@ -814,14 +821,13 @@ class Cluster(NamedTuple('Cluster',
         return super(Cluster, cls).__new__(cls, *args, **kwargs)
 
     @property
-    def last_lsn(self) -> int:
-        """Last known leader LSN."""
-        return self.status.last_lsn
+    def slots(self) -> Dict[str, int]:
+        """State of permanent replication slots on the primary in the format: ``{"slot_name": int}``.
 
-    @property
-    def slots(self) -> Optional[Dict[str, int]]:
-        """State of permanent replication slots on the primary in the format: ``{"slot_name": int}``."""
-        return self.status.slots
+        .. note::
+            We are trying to be foolproof here and for values that can't be parsed to :class:`int` will return ``0``.
+        """
+        return {k: parse_int(v) or 0 for k, v in (self.status.slots or {}).items()}
 
     @staticmethod
     def empty() -> 'Cluster':
@@ -833,9 +839,9 @@ class Cluster(NamedTuple('Cluster',
 
         :returns: ``True`` if all attributes of the current :class:`Cluster` are unpopulated.
         """
-        return all((self.initialize is None, self.config is None, self.leader is None, self.last_lsn == 0,
+        return all((self.initialize is None, self.config is None, self.leader is None, self.status.is_empty(),
                     self.members == [], self.failover is None, self.sync.version is None,
-                    self.history is None, self.slots is None, self.failsafe is None, self.workers == {}))
+                    self.history is None, self.failsafe is None, self.workers == {}))
 
     def __len__(self) -> int:
         """Implement ``len`` function capability.
@@ -934,8 +940,9 @@ class Cluster(NamedTuple('Cluster',
         """Dictionary of permanent replication slots with their known LSN."""
         ret: Dict[str, Union[Dict[str, Any], Any]] = global_config.permanent_slots
 
-        members: Dict[str, int] = {slot_name_from_member_name(m.name): m.lsn or 0 for m in self.members}
-        slots: Dict[str, int] = {k: parse_int(v) or 0 for k, v in (self.slots or {}).items()}
+        members: Dict[str, int] = {slot_name_from_member_name(m.name): m.lsn or 0
+                                   for m in self.members if m.replicatefrom}
+        slots: Dict[str, int] = self.slots
         for name, value in list(ret.items()):
             if not value:
                 value = ret[name] = {}
@@ -1600,15 +1607,16 @@ class AbstractDCS(abc.ABC):
             self.reset_cluster()
             raise
 
-        self._last_seen = int(time.time())
-        self._last_status = {self._OPTIME: cluster.last_lsn}
-        if cluster.slots:
-            self._last_status['slots'] = cluster.slots
-        self._last_failsafe = cluster.failsafe
-
         with self._cluster_thread_lock:
             self._cluster = cluster
             self._cluster_valid_till = time.time() + self.ttl
+
+            self._last_seen = int(time.time())
+            self._last_status = {self._OPTIME: cluster.status.last_lsn}
+            if cluster.status.slots:
+                self._last_status['slots'] = cluster.status.slots
+            self._last_failsafe = cluster.failsafe
+
             return cluster
 
     @property
diff --git a/patroni/ha.py b/patroni/ha.py
index 8bbcaf66..a9177387 100644
--- a/patroni/ha.py
+++ b/patroni/ha.py
@@ -993,7 +993,7 @@ class Ha(object):
 
         :returns True when node is lagging
         """
-        lag = (self.cluster.last_lsn or 0) - wal_position
+        lag = self.cluster.status.last_lsn - wal_position
         return lag > global_config.maximum_lag_on_failover
 
     def _is_healthiest_node(self, members: Collection[Member], check_replication_lag: bool = True) -> bool:
diff --git a/patroni/utils.py b/patroni/utils.py
index 560d2570..08a1f3cb 100644
--- a/patroni/utils.py
+++ b/patroni/utils.py
@@ -946,7 +946,7 @@ def cluster_as_json(cluster: 'Cluster') -> Dict[str, Any]:
 
     config = global_config.from_cluster(cluster)
     leader_name = cluster.leader.name if cluster.leader else None
-    cluster_lsn = cluster.last_lsn or 0
+    cluster_lsn = cluster.status.last_lsn
 
     ret: Dict[str, Any] = {'members': []}
     for m in cluster.members:
diff --git a/tests/test_api.py b/tests/test_api.py
index bc7f5263..e4e9676a 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -204,7 +204,7 @@ class TestRestApiHandler(unittest.TestCase):
 
     def test_do_GET(self):
         MockPostgresql.pending_restart_reason = {'max_connections': get_param_diff('200', '100')}
-        MockPatroni.dcs.cluster.last_lsn = 20
+        MockPatroni.dcs.cluster.status.last_lsn = 20
         MockPatroni.dcs.cluster.sync.members = [MockPostgresql.name]
         with patch.object(global_config.__class__, 'is_synchronous_mode', PropertyMock(return_value=True)):
             MockRestApiServer(RestApiHandler, 'GET /replica')
diff --git a/tests/test_slots.py b/tests/test_slots.py
index 3d5a7cee..d7ea61bf 100644
--- a/tests/test_slots.py
+++ b/tests/test_slots.py
@@ -213,7 +213,7 @@ class TestSlotsHandler(BaseTestPostgresql):
     @patch.object(Postgresql, 'is_primary', Mock(return_value=False))
     def test__ensure_logical_slots_replica(self):
         self.p.set_role('replica')
-        self.cluster.slots['ls'] = 12346
+        self.cluster.status.slots['ls'] = 12346
         with patch.object(SlotsHandler, 'check_logical_slots_readiness', Mock(return_value=False)):
             self.assertEqual(self.s.sync_replication_slots(self.cluster, self.tags), [])
         with patch.object(SlotsHandler, '_query', Mock(return_value=[('ls', 'logical', 499, 'b', 'a', 5, 100, 500)])), \
@@ -222,10 +222,10 @@ class TestSlotsHandler(BaseTestPostgresql):
                 patch.object(psycopg.OperationalError, 'diag') as mock_diag:
             type(mock_diag).sqlstate = PropertyMock(return_value='58P01')
             self.assertEqual(self.s.sync_replication_slots(self.cluster, self.tags), ['ls'])
-        self.cluster.slots['ls'] = 'a'
+        self.cluster.status.slots['ls'] = 'a'
         self.assertEqual(self.s.sync_replication_slots(self.cluster, self.tags), [])
         self.cluster.config.data['slots']['ls']['database'] = 'b'
-        self.cluster.slots['ls'] = '500'
+        self.cluster.status.slots['ls'] = '500'
         with patch.object(MockCursor, 'rowcount', PropertyMock(return_value=1), create=True):
             self.assertEqual(self.s.sync_replication_slots(self.cluster, self.tags), ['ls'])
 
diff --git a/tests/test_zookeeper.py b/tests/test_zookeeper.py
index 4aa46194..eebc254b 100644
--- a/tests/test_zookeeper.py
+++ b/tests/test_zookeeper.py
@@ -176,7 +176,7 @@ class TestZooKeeper(unittest.TestCase):
 
     def test_get_cluster(self):
         cluster = self.zk.get_cluster()
-        self.assertEqual(cluster.last_lsn, 500)
+        self.assertEqual(cluster.status.last_lsn, 500)
 
     def test__get_citus_cluster(self):
         self.zk._mpp = get_mpp({'citus': {'group': 0, 'database': 'postgres'}})