It takes the name of the virtual machine and the values to be entered in the annotation of the virtual machine as string input and updates the annotation in Center (VMware vRO action, vSphere)

updateVMAnnotation.js

// VMware vRealize Orchestrator action sample
// vRA 8.4

//action input type: vm (VC:VirtualMachine), newNotes (string)
//action return type: string


if(vm==null){
    throw("You have not made an entry for virtual machine");
}

else if(newNotes==null){
    throw("You have not made an entry for annotation")
}
else {
    var oldNotes = vm.summary.config.annotation;
    if (oldNotes == null){oldNotes = "";}
    System.log("Old VM Notes: "+oldNotes);


    // Now set the new Notes:
    // Start by creating a ConfigSpec
    var configSpec = new VcVirtualMachineConfigSpec();


    // Update the annotation property with new value
    configSpec.annotation = newNotes;


    // launch task to reconfig the vm with the new configspec
    // NOTE: This is safe to apply with powered on VM
    var task = vm.reconfigVM_Task(configSpec);

    System.log("Current VM Notes: "+newNotes);


}