Added metrics for Geo-Replication

Author: EldertGrootenboer

articles/service-bus-messaging/monitor-service-bus-reference.md

@@ -78,11 +78,19 @@ The following two types of errors are classified as **user errors**:
 |Memory size usage per namespace| No | Memory Usage | Percent | The percentage memory usage of the namespace. | Replica |
 
 ### Error metrics
+
 | Metric Name |  Exportable via diagnostic settings | Unit | Aggregation type |  Description | Dimensions |
 | ------------------- | ----------------- | --- | --- | --- | --- | 
 |Server Errors| No | Count | Total | The number of requests not processed because of an error in the Service Bus service over a specified period. | Entity name<br/><br/>Operation Result |
 |User Errors | No | Count | Total | The number of requests not processed because of user errors over a specified period. | Entity name<br/><br/>Operation Result|
 
+### Geo-Replication metrics
+
+| Metric Name |  Exportable via diagnostic settings | Unit | Aggregation type |  Description | Dimensions |
+| ------------------- | ----------------- | --- | --- | --- | --- | 
+|Replication Lag Duration| No | Seconds | Average | The offset in seconds between the latest action on the primary and the secondary regions. | |
+|Replication Lag Count | No | Count | Average | The offset in number of operations between the latest action on the primary and the secondary regions. | |
+
 ## Metric dimensions
 
 Azure Service Bus supports the following dimensions for metrics in Azure Monitor. Adding dimensions to your metrics is optional. If you don't add dimensions, metrics are specified at the namespace level.