Load Balancing

Depending on your deployment design and the number of concurrent recorded sessions, you may need to deploy additional ITM On-Prem (ObserveIT) Application Servers.

For the steps required to install additional Application Server(s), see Installing ITM On-Prem (ObserveIT) Application Server.

When deploying more than one Application Server, you need to load balance the Agent connections with the multiple Application Servers. You may use software-based load balancing solutions, such as Microsoft Network Load Balancing (NLB), or hardware-based solutions, such as F5, Citrix NetScaler, or others.

Checking the Status of the Application Servers

A keep-alive component is required so that the load balancer can check the status of the ITM On-Prem (ObserveIT) Application Servers.

The probe URL for the Application Server keep-alive is:

If using HTTP:

http://{App_Server_FQDN}:4884/ObserveitApplicationServer/v2/apis/health/_health

4884 is the default port, it can be changed through IIS, and if needed SSL can also be enabled (which usually changes the port to 443).

If using HTTPS:

https://{App_Server_FQDN}/ObserveitApplicationServer/v2/apis/health/_health

Expected reply: 200

For example:

{"_status":{"status":200,"code":"it:error:none","context":{"transactionId":"","correlationId":""}},"_meta":{"origin":{},"stats":{}},"status":"Healthy","database":{"status":"Healthy","roundTripTime":"00:00:00.0017518"},"fileSystem":{"status":"Healthy","roundTripTime":"00:00:00.0033923"}}

You can change the health check interval to 10 seconds by editing the HealthCheckSecondsInterval value in the web.config file on the Application Server(s).

Additional Health Check

URL/API

This URL checks that the application servers are alive and ready to accept traffic from the agents

https://HOSTNAME:PORT/ObserveITApplicationServer/OfflineWorkManager.asmx/IsConnected

The following indicates that the Application server and database are OK:

Look for the word “true”

<boolean xmlns="http://ObserveIT.WebServices/OfflineWorkManager.asmx/">true</boolean>

This XML file does not appear to have any style information.