diff --git a/README.md b/README.md
index 6e93df2..87d61bf 100644
--- a/README.md
+++ b/README.md
@@ -104,7 +104,12 @@ You can setup env through `.env` file or environment variables with defined as d
 
 ## Changelog
 
-### Version 0.5.0 (UNRELEASED)
+### Version 0.5.1 (2023-09-01)
+
+- FIX `opnsense_server_ha_state` calls were not
+  implemented
+
+### Version 0.5.0 (2023-09-01)
 
 - add role label in metrics
 - all to configure supervised interfaces using `--opnsense-interfaces`
diff --git a/opnsense_exporter/server.py b/opnsense_exporter/server.py
index 08d40cc..d2037a1 100644
--- a/opnsense_exporter/server.py
+++ b/opnsense_exporter/server.py
@@ -91,6 +91,12 @@ class OPNSensePrometheusExporter:
         backup_ha_state.labels(
             instance=self.exporter_instance, **self.backup.labels
         ).state(backup_sate.value)
+        opnsense_server_ha_state.labels(
+            instance=self.exporter_instance, **self.main.labels
+        ).state(main_state.value)
+        opnsense_server_ha_state.labels(
+            instance=self.exporter_instance, **self.backup.labels
+        ).state(backup_sate.value)
         active_opnsense = None
         if main_state == OPNSenseHAState.ACTIVE:
             active_opnsense = self.main
diff --git a/tests/test_server.py b/tests/test_server.py
index f14c941..5e67518 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -125,6 +125,7 @@ def test_process_requests():
 
     main_ha_state_mock = FakePromEnum()
     backup_ha_state_mock = FakePromEnum()
+    opnsense_server_ha_state_mock = FakePromEnum()
     opnsense_active_server_traffic_rate_mock = FakePromGauge()
 
     with mock.patch("opnsense_exporter.server.main_ha_state", new=main_ha_state_mock):
@@ -132,15 +133,33 @@ def test_process_requests():
             "opnsense_exporter.server.backup_ha_state", new=backup_ha_state_mock
         ):
             with mock.patch(
-                "opnsense_exporter.server.opnsense_active_server_traffic_rate",
-                new=opnsense_active_server_traffic_rate_mock,
+                "opnsense_exporter.server.opnsense_server_ha_state",
+                new=opnsense_server_ha_state_mock,
             ):
-                OPNSensePrometheusExporter(
-                    OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
-                    OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
-                    "wan",
-                ).process_requests()
+                with mock.patch(
+                    "opnsense_exporter.server.opnsense_active_server_traffic_rate",
+                    new=opnsense_active_server_traffic_rate_mock,
+                ):
+                    OPNSensePrometheusExporter(
+                        OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
+                        OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
+                        "wan",
+                    ).process_requests()
 
+    assert opnsense_server_ha_state_mock.count_state_calls == 2
+    assert opnsense_server_ha_state_mock._labels_calls == [
+        {
+            "instance": "",
+            "host": MAIN_HOST,
+            "role": "main",
+        },
+        {
+            "instance": "",
+            "host": BACKUP_HOST,
+            "role": "backup",
+        },
+    ]
+    assert opnsense_server_ha_state_mock._state_calls == ["active", "hot_standby"]
     assert main_ha_state_mock._state == "active"
     assert main_ha_state_mock.count_state_calls == 1, main_ha_state_mock._state_calls
     assert main_ha_state_mock._labels == {
@@ -197,6 +216,7 @@ def test_process_requests_backup_active():
 
     main_ha_state_mock = FakePromEnum()
     backup_ha_state_mock = FakePromEnum()
+    opnsense_server_ha_state_mock = FakePromEnum()
     opnsense_active_server_traffic_rate_mock = FakePromGauge()
 
     with mock.patch("opnsense_exporter.server.main_ha_state", new=main_ha_state_mock):
@@ -204,14 +224,33 @@ def test_process_requests_backup_active():
             "opnsense_exporter.server.backup_ha_state", new=backup_ha_state_mock
         ):
             with mock.patch(
-                "opnsense_exporter.server.opnsense_active_server_traffic_rate",
-                new=opnsense_active_server_traffic_rate_mock,
+                "opnsense_exporter.server.opnsense_server_ha_state",
+                new=opnsense_server_ha_state_mock,
             ):
-                OPNSensePrometheusExporter(
-                    OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
-                    OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
-                    "wan",
-                ).process_requests()
+                with mock.patch(
+                    "opnsense_exporter.server.opnsense_active_server_traffic_rate",
+                    new=opnsense_active_server_traffic_rate_mock,
+                ):
+                    OPNSensePrometheusExporter(
+                        OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
+                        OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
+                        "wan",
+                    ).process_requests()
+
+    assert opnsense_server_ha_state_mock.count_state_calls == 2
+    assert opnsense_server_ha_state_mock._labels_calls == [
+        {
+            "instance": "",
+            "host": MAIN_HOST,
+            "role": "main",
+        },
+        {
+            "instance": "",
+            "host": BACKUP_HOST,
+            "role": "backup",
+        },
+    ]
+    assert opnsense_server_ha_state_mock._state_calls == ["maintenancemode", "active"]
     assert main_ha_state_mock._state == "maintenancemode"
     assert main_ha_state_mock.count_state_calls == 1
     assert main_ha_state_mock._labels == {
@@ -269,6 +308,7 @@ def test_process_no_active():
 
     main_ha_state_mock = FakePromEnum()
     backup_ha_state_mock = FakePromEnum()
+    opnsense_server_ha_state_mock = FakePromEnum()
     opnsense_active_server_traffic_rate_mock = FakePromGauge()
 
     with mock.patch("opnsense_exporter.server.main_ha_state", new=main_ha_state_mock):
@@ -276,15 +316,36 @@ def test_process_no_active():
             "opnsense_exporter.server.backup_ha_state", new=backup_ha_state_mock
         ):
             with mock.patch(
-                "opnsense_exporter.server.opnsense_active_server_traffic_rate",
-                new=opnsense_active_server_traffic_rate_mock,
+                "opnsense_exporter.server.opnsense_server_ha_state",
+                new=opnsense_server_ha_state_mock,
             ):
-                OPNSensePrometheusExporter(
-                    OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
-                    OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
-                    "wan",
-                ).process_requests()
+                with mock.patch(
+                    "opnsense_exporter.server.opnsense_active_server_traffic_rate",
+                    new=opnsense_active_server_traffic_rate_mock,
+                ):
+                    OPNSensePrometheusExporter(
+                        OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
+                        OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
+                        "wan",
+                    ).process_requests()
 
+    assert opnsense_server_ha_state_mock.count_state_calls == 2
+    assert opnsense_server_ha_state_mock._labels_calls == [
+        {
+            "instance": "",
+            "host": MAIN_HOST,
+            "role": "main",
+        },
+        {
+            "instance": "",
+            "host": BACKUP_HOST,
+            "role": "backup",
+        },
+    ]
+    assert opnsense_server_ha_state_mock._state_calls == [
+        "maintenancemode",
+        "unavailable",
+    ]
     assert main_ha_state_mock._state == "maintenancemode"
     assert main_ha_state_mock.count_state_calls == 1
     assert main_ha_state_mock._labels == {
@@ -325,6 +386,7 @@ def test_process_with_falsy_value():
 
     main_ha_state_mock = FakePromEnum()
     backup_ha_state_mock = FakePromEnum()
+    opnsense_server_ha_state_mock = FakePromEnum()
     opnsense_active_server_traffic_rate_mock = FakePromGauge()
 
     with mock.patch("opnsense_exporter.server.main_ha_state", new=main_ha_state_mock):
@@ -332,14 +394,33 @@ def test_process_with_falsy_value():
             "opnsense_exporter.server.backup_ha_state", new=backup_ha_state_mock
         ):
             with mock.patch(
-                "opnsense_exporter.server.opnsense_active_server_traffic_rate",
-                new=opnsense_active_server_traffic_rate_mock,
+                "opnsense_exporter.server.opnsense_server_ha_state",
+                new=opnsense_server_ha_state_mock,
             ):
-                OPNSensePrometheusExporter(
-                    OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
-                    OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
-                    "wan",
-                ).process_requests()
+                with mock.patch(
+                    "opnsense_exporter.server.opnsense_active_server_traffic_rate",
+                    new=opnsense_active_server_traffic_rate_mock,
+                ):
+                    OPNSensePrometheusExporter(
+                        OPNSenseAPI(OPNSenseRole.MAIN, MAIN_HOST, LOGIN, PASSWORD),
+                        OPNSenseAPI(OPNSenseRole.BACKUP, BACKUP_HOST, LOGIN, PASSWORD),
+                        "wan",
+                    ).process_requests()
+
+    assert opnsense_server_ha_state_mock.count_state_calls == 2
+    assert opnsense_server_ha_state_mock._labels_calls == [
+        {
+            "instance": "",
+            "host": MAIN_HOST,
+            "role": "main",
+        },
+        {
+            "instance": "",
+            "host": BACKUP_HOST,
+            "role": "backup",
+        },
+    ]
+    assert opnsense_server_ha_state_mock._state_calls == ["active", "hot_standby"]
     assert main_ha_state_mock._state == "active"
     assert main_ha_state_mock.count_state_calls == 1
     assert main_ha_state_mock._labels == {