re-factor notifications, add sms and matrix as channels

hbd/server/threshold.py

@@ -1003,9 +1003,15 @@ class ThresholdChecker:
         value: Any,
     ):
         """Send notification and log to journal/eventlog."""
-        # Send notification using host-specific channels
         try:
-            notify_mod.pushmsg_for_host(host_name, f"{lvl}: {host_name} - {message}")
+            notify_mod.send_notification(
+                host_name,
+                notify_mod.Notification(
+                    title=f"[{lvl}] {host_name}",
+                    body=message,
+                    level=lvl,
+                ),
+            )
             logger.info("Notification sent: %s", message)
         except Exception as e:
             logger.error("Failed to send notification: %s", e)
@@ -1137,9 +1143,15 @@ class ThresholdChecker:
             else:
                 message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} (ongoing for {int(now - alert_state.since)}s)"
             
-            # Send re-notification using host-specific channels
             try:
-                notify_mod.pushmsg_for_host(host_name, message)
+                notify_mod.send_notification(
+                    host_name,
+                    notify_mod.Notification(
+                        title=f"[REMINDER/{alert_state.level.name}] {host_name}",
+                        body=message,
+                        level=alert_state.level.name,
+                    ),
+                )
                 alert_state.last_notification = now
                 alert_state.notification_count += 1
                 logger.info("Re-notification sent: %s", message)