When you build a service to be shared by multiple customers or tenants, you can build it to be multitenanted. A benefit of multitenant systems is that resources can be pooled and shared among tenants. This often results in lower costs and improved efficiency. However, if a single tenant uses a disproportionate amount of the resources available in the system, the overall performance of the system can suffer. The noisy neighbor problem occurs when one tenant's performance is degraded because of the activities of another tenant.

https://learn.microsoft.com/en-us/azure/architecture/antipatterns/noisy-neighbor/noisy-neighbor