Remove the Monitoring server association
To remove the Monitoring Server, you need to change or clear the dependency on the associated Front End pool, Front End Server, Survivable Branch Appliance, and Survivable Branch Server. You edit the properties of the Front End pool, Front End Server, Survivable Branch Appliance, and Survivable Branch Server to remove the dependency. After you clear the dependency and delete the server in Topology Builder, you are notified that the associated database store object in Topology Builder will also be deleted.
To remove the Monitoring Server association
On the Skype for Business Server 2019 Front End Server, open Topology Builder.
Navigate to the legacy installs node.
In Topology Builder, expand Enterprise Edition Front End pools, Standard Edition Front End Servers, or Branch sites, depending on where the Monitoring Server is defined.
If you have Survivable Branch Server associated, expand Branch sites, expand the branch site name, and then expand Survivable Branch Appliances.
Survivable Branch Appliances in the user interface applies to both Survivable Branch Server and Survivable Branch Appliance.
Right-click the pool, server, or device that is associated with the Monitoring Server, and then click Edit Properties.
In Edit Properties, under General > Associations, clear the Associate Monitoring Server check box, and then click OK.
Repeat the previous step for any other pool, server, or device associated with the Monitoring Server.
Right-click the Monitoring Server, and then click Delete.
On Delete Dependent Stores, click OK.
Publish the topology, check replication status, and run the Skype for Business Server Deployment Wizard as needed.