[Improve] optimize prompt (apache#3270)

Co-authored-by: Logic <[email protected]>
Co-authored-by: aias00 <[email protected]>

Author: 3 people

hertzbeat-mcp/src/main/java/org/apache/hertzbeat/mcp/server/service/LogService.java

@@ -69,6 +69,8 @@ public String getHertzbeatLog(
                    - Get latest 10 logs: SELECT * FROM hzb_log ORDER BY timestamp DESC LIMIT 10
                    - Query ERROR level logs: SELECT * FROM hzb_log WHERE severity_number=17
                    - Query specific time range: SELECT * FROM hzb_log WHERE timestamp > '2024-01-01 00:00:00'
+                   - Query last ten minutes: SELECT * FROM hzb_log WHERE  timestamp >= now() - Interval '10m' AND timestamp < now()
+                   - Query logs at or above the INFO level: SELECT * FROM hzb_log WHERE severity_number >= 9
                 
                 Field descriptions:
                 1. severity_number (log level):