Update diagnostic-services.md

Author: leonard520

articles/spring-apps/diagnostic-services.md

@@ -36,7 +36,7 @@ Choose the log category and metric category you want to monitor.
 |Log | Description |
 |----|----|
 | **ApplicationConsole** | Console log of all customer applications. |
-| **SystemLogs** | Currently, only [Spring Cloud Config Server](https://cloud.spring.io/spring-cloud-config/reference/html/#_spring_cloud_config_server) logs in this category. |
+| **SystemLogs** | Currently, only [Spring Cloud Config Server](https://cloud.spring.io/spring-cloud-config/reference/html/#_spring_cloud_config_server) logs in this category. All available LogTypes are `ConfigServer`(Basic/Standard tier only), `ServiceRegistry`(all tiers), `ApiPortal`(Enterprise tier only), `ApplicationConfigurationService`(Enterprise tier only), `SpringCloudGateway` (Enterprise tier only), `SpringCloudGatewayOperator` (Enterprise tier only) |
 | **IngressLogs** | [Ingress logs](#show-ingress-log-entries-containing-a-specific-host) of all customer's applications, only access logs. |
 | **BuildLogs** | [Build logs](#show-build-log-entries-for-a-specific-app) of all customer's applications for each build stage. |
 
@@ -238,7 +238,8 @@ AppPlatformSystemLogs 
 | limit 100
 ```
 
-To review log entries for VMware Spring Cloud Gateway Operator in Enterprise tier, run the following query:
+
+There is another component named Spring Cloud Gateway Operator. It controls the lifecycle of Spring Cloud Gateway and routes. If you have any issue related why the route doesn't take effective, you may check the logs here. To review log entries for VMware Spring Cloud Gateway Operator in Enterprise tier, run the following query:
 
 ```sql
 AppPlatformSystemLogs