Like with many issues in technology today, that is too complex a problem to have a simple answer. Capacity management can avoid a whole host of things, that can become problems. By watching your environment and understanding the resource consumption rates you could set alerts to focus your attention on that particular asset and begin your remediation processes. If your organization has the wherewithal to increase the asset's capacity when it is needed great, but you might simply be setting expectations of lower performance because the organization cannot afford the increase necessary.
Alerting against something that is already a problem is also helpful, because if you fix it before a consumer of the asset is even aware of the incident that is a good thing. Many times it is the upstream systems users are interacting with and so the alerts for foundation components help focus remediation efforts.