diff --git a/ariadne/services/cluster_state_anomalies.py b/ariadne/services/cluster_state_anomalies.py
index 63b4e46..cd9167b 100644
--- a/ariadne/services/cluster_state_anomalies.py
+++ b/ariadne/services/cluster_state_anomalies.py
@@ -34,13 +34,7 @@ def _pvc_pressure_signals(metrics: dict[str, Any]) -> list[dict[str, Any]]:
     return output
 
 
-def _build_anomalies(
-    metrics: dict[str, Any],
-    nodes_summary: dict[str, Any],
-    workloads_health: dict[str, Any],
-    kustomizations: dict[str, Any],
-    events: dict[str, Any],
-) -> list[dict[str, Any]]:
+def _build_anomalies(metrics: dict[str, Any], nodes_summary: dict[str, Any], workloads_health: dict[str, Any], kustomizations: dict[str, Any], events: dict[str, Any]) -> list[dict[str, Any]]:
     anomalies: list[dict[str, Any]] = []
     _append_pod_anomalies(anomalies, metrics)
     _append_workload_anomalies(anomalies, workloads_health)
@@ -73,9 +67,7 @@ def _append_pod_anomalies(anomalies: list[dict[str, Any]], metrics: dict[str, An
         )
 
 
-def _append_workload_anomalies(
-    anomalies: list[dict[str, Any]], workloads_health: dict[str, Any]
-) -> None:
+def _append_workload_anomalies(anomalies: list[dict[str, Any]], workloads_health: dict[str, Any]) -> None:
     for key in ("deployments", "statefulsets", "daemonsets"):
         entry = workloads_health.get(key) if isinstance(workloads_health.get(key), dict) else {}
         not_ready = entry.get("not_ready") or 0
diff --git a/tests/unit/services/test_cluster_state_context_domains.py b/tests/unit/services/test_cluster_state_context_domains.py
index 42e6e9f..04aaadb 100644
--- a/tests/unit/services/test_cluster_state_context_domains.py
+++ b/tests/unit/services/test_cluster_state_context_domains.py
@@ -151,7 +151,13 @@ def test_health_anomaly_signal_profile_and_attention_domains() -> None:
     anomaly_rows = anomalies._build_anomalies(metrics, nodes_summary, workloads_health, kustomizations, events)
     assert {row["kind"] for row in anomaly_rows} >= {"pods_pending", "pvc_pressure", "flux_not_ready"}
     assert anomalies._severity_rank("critical") == 0
+    assert anomalies._severity_rank("unknown") == 2
     assert anomalies._pvc_pressure_signals(metrics)[0]["target"] == "apps/data"
+    assert anomalies._pvc_pressure_signals({"pvc_usage_top": [{"metric": {"namespace": "apps", "persistentvolumeclaim": "cold"}, "value": 79.0}]}) == []
+    without_optional = []
+    anomalies._append_node_anomalies(without_optional, {})
+    anomalies._append_event_anomalies(without_optional, {})
+    assert without_optional == []
 
     bullets = health._health_bullets(metrics, nodes_summary, workloads_health, anomaly_rows)
     assert bullets[0] == "Nodes ready: 1/2"