The Application Topology page displays the architecture and performance metrics of all business systems that are being monitored in the form of a table or a topology. By default, the information is displayed in the form of a topology.
Overview of topologies
A topology is a graph that shows the call relationships and dependencies between applications in a visualized manner. In a trace topology, each icon represents a node, which is an application that is called in the trace. Each connection line between two nodes represents a call relationship. A topology can display call relationships between services across applications. You can click a connection line or an arrow to view the call relationship between the relevant nodes.
The color of the connection line between two nodes reflects the time consumption of inter-application calls, which clearly shows the call status.
Topology items
A topology is a graph that shows the call relationships and dependencies between applications in a visualized manner. In a trace topology, each icon represents a node, which is an application that is called in the trace. You can drag and drop the items in the topology. The following table describes the topology items.
Item | Description |
| A user. Note You cannot view information such as metric data by clicking a node of this type. |
| The current workspace application allows you to view the monitoring overview information of the node, including the number of requests, response time, and error rate. |
| For other workspace applications, you cannot view the monitoring overview information of nodes. |
| A message queue (MQ) service. You cannot view the overall monitoring information about a node of this type. |
| A database (DB) service. You cannot view the overall monitoring information about a node of this type. |
| A cache application. You cannot view the overall monitoring information about a node of this type. |
| The line connecting two application nodes. It indicates the call relationship between two application nodes and is directional.
|
Metric description
Distributed links are marked with different topology icon colors. Blue indicates a healthy application, yellow indicates an exception with the application, and red indicates an error in the application. This allows users to quickly focus on unhealthy applications, locate exceptional links, and complete troubleshooting.
In addition, you can hover the cursor over the node or node connection representing the application to see monitoring overview information, such as the number of requests and error rate. For the specific metric description, see the table below.
Metric Item | Description |
Health status | The thresholds of request error rate and time consumption satisfaction are aggregated for computing. The health status is as follows:
|
Number of requests | Total number of requests for the current application-related link, in times. |
Response time | Response time for all requests for the current application-related link, in milliseconds. |
Error Rate | Error rate of the current application-related link (Total number of errors/Total number of requests), in the unit of %. |
Satisfaction | Each response of the application is timed and an interval is defined. For more information, see Configure a distributed link satisfaction. |
Protocol | Protocol type of the current application-related link. |
Average time consumption | Average time consumption of all requests for the current application-related link, in milliseconds. |
Health: 
Exception: 
Error: View details of the application topology
The application topology shows the traces that are relevant to each application being monitored. On Application Topology page, you can view the upstream and downstream nodes of an application and the call relationships between nodes. The topology helps you identify the performance bottleneck of an application with efficiency.
In the left-side navigation pane, click Distributed Trace > Application Topology.
View the following information on this page:
The topology in a specific time range.
NoteUse the time picker in the upper-right corner to specify a time range.
Hover the cursor over Legend to view the legend information of the topology element.
The number of requests, response time, and error rate of an application in a specific time range.
NoteMove the pointer over the icon of a node to view the relevant monitoring information.
The information about services calls for an application in a specific time range.
NoteClick a point on a connection line or an arrow to view the details of the trace between two applications, such as the number of requests and average response time.
Click Query in the Real-time Trace column to be redirected to the Trace Query page for distributed traces.
Related operations
You can use the buttons in the upper-right corner of the topology page to perform the following operations on the topology.
Operation | Description |
Search for an application in the topology | Enter the name of the application that you want to find in the search box and click Exact search by application name is supported. After the application is retrieved, the application details panel appears. You can view the performance metric data of the application in a specified time range in the panel. |
Display the topology in graphic form | Click |
Display the topology in list form | Click |
Configure link sampling | Click |
Zoom in or out the topology | Click Click |
Restore the topology to the default size | Click |
Display the topology in the full screen mode | Click After you enter the full screen mode, click the icon again to exit the mode. |
Specify a time range | Select a time range from the drop-down list in the upper right corner. For example, you can select 1 Hour. |
. 
. 
. 
. For more information, see 
to proportionally zoom out the topology. 
to proportionally zoom in the topology. 
to restore the topology to the default size, which is 100%. 
.