checkers are now objects, lay foundation for persistent alerts

src/lego_monitoring/alerting/current.py

@@ -0,0 +1,26 @@
+from typing import Optional
+
+from .alert import Alert
+from .enum import AlertType, Severity
+
+
+class CurrentAlerts(list[Alert]):
+    def get_severity(self) -> Optional[Severity]:
+        max_severity = None
+        for a in self:
+            if max_severity is None or a.severity > max_severity:
+                max_severity = a.severity
+        return a.severity
+
+    def get_types(self) -> set[AlertType]:
+        types = set()
+        for a in self:
+            types.add(a.alert_type)
+        return types
+
+    def update(self, alerts: list[Alert]) -> tuple[Optional[Severity], Optional[Severity]]:
+        old_severity = self.get_severity()
+        self.clear()
+        self.extend(alerts)
+        new_severity = self.get_severity()
+        return (old_severity, new_severity)