Several approaches can be taken here. First, if you’re using windows server you should look into high density robots, this allows for you to use one machine for multiple robot windows sessions, reference: High-Density Robots. This way you can disable a machine in Orchestrator conduct your maintenance and bring it back without interruption.
There is also maintenance API calls to stop robots current job and place the Orchestrator into maintenance mode. This is a bigger “hammer” however, I have used it for environment upgrades etc. Reference: Maintenance mode
I also created a script to manage the maintenance mode reference marketplace here: Orchestrator Maintenance Mode - RPA Component | UiPath Marketplace
Let me know your thoughts.
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