Discovery refers to the process of identifying unmanaged hosts and targets in your environment. Targets are entities such as host machines, databases, Fusion Middleware components, that can be managed and monitored in Enterprise Manager Cloud Control. Make sure that all hosts and targets are monitored in Enterprise Manager so that troubleshooting issues is as easy as possible.
Use Enterprise Manager to discover all targets in your environment as described in the Enterprise Manager Cloud Control Administrator's Guide.
Note:
If a target (for example, a host) fails and it has not been discovered, as described above, there will be no indication of the source of the issue in the Enterprise Manager console.