I am trying to understand the scalability or limit in terms of number of users , applications build or integrations that can be set up on a single instance of ServiceNow production environment before we see performance degradation
Our enterprise has about 20k employees (users), and we only have one instance of ServiceNow. We recently also launched HR within the same ITSM instance.
ServiceNow will scale accordingly without intervention (besides a Change notification/approval) from you/your company. Technically, i see no need for separate instances due to any limits of users, applications, or integrations.