fix(monitoring): classify host memory pressure accurately

apps/api/tests/test_classify_alert_early.py

@@ -103,6 +103,10 @@ class TestInfrastructure:
         assert ac == "host_resource"
 
     def test_host_memory(self):
+        ac, nt = classify_alert_early("HostMemoryUsageHigh", "warning", {})
+        assert ac == "host_resource"
+
+    def test_historical_host_out_of_memory_alias(self):
         ac, nt = classify_alert_early("HostOutOfMemory", "warning", {})
         assert ac == "host_resource"
 

apps/api/tests/test_get_incident_type.py

@@ -21,6 +21,11 @@ class TestGetIncidentTypeStaticFallback:
         result = get_incident_type("HostHighCpuLoad")
         assert result == "host_cpu"
 
+    @pytest.mark.parametrize("alertname", ["HostMemoryUsageHigh", "HostOutOfMemory"])
+    def test_memory_pressure_taxonomy_and_historical_alias(self, alertname):
+        """新記憶體壓力名稱與歷史事件 alias 都維持 host_memory。"""
+        assert get_incident_type(alertname) == "host_memory"
+
     def test_known_alertname_k8s(self):
         """KubePodCrashLooping → k8s_pod_crash"""
         result = get_incident_type("KubePodCrashLooping")