优化

event-bridge-service/src/main/java/com/baiyue/eventbridge/mapper/BridgeInboxMapper.java

@@ -2,6 +2,7 @@ package com.baiyue.eventbridge.mapper;
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baiyue.eventbridge.domain.BridgeInbox;
+import com.baiyue.eventbridge.metrics.InboxMetricsSnapshot;
 import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 import org.apache.ibatis.annotations.Select;
@@ -60,4 +61,21 @@ public interface BridgeInboxMapper extends BaseMapper<BridgeInbox> {
             WHERE event_id=#{eventId} AND status='DEAD'
             """)
     int replayDead(@Param("eventId") String eventId, @Param("reason") String reason);
+
+    /**
+     * Scheduled observability aggregation. The status predicate uses idx_bridge_inbox_consume;
+     * Prometheus collection never invokes this query directly.
+     */
+    @Select("""
+            SELECT target_region AS targetRegion, event_type AS eventType,
+              SUM(CASE WHEN status IN ('RECEIVED','RETRY','PROCESSING') THEN 1 ELSE 0 END) AS backlogCount,
+              COALESCE(TIMESTAMPDIFF(MICROSECOND,
+                MIN(CASE WHEN status IN ('RECEIVED','RETRY','PROCESSING') THEN received_at END),
+                CURRENT_TIMESTAMP(3)) / 1000000.0, 0) AS oldestPendingAgeSeconds,
+              SUM(CASE WHEN status='DEAD' THEN 1 ELSE 0 END) AS deadCount
+            FROM bridge_inbox
+            WHERE status IN ('RECEIVED','RETRY','PROCESSING','DEAD')
+            GROUP BY target_region, event_type
+            """)
+    List<InboxMetricsSnapshot> observabilitySnapshots();
 }