A BIG-IP Administrator is cleaning up unused Virtual Servers and pools via the Configuration Utility while trying to delete certain administrator receives an error message that indicates that the pool

Disabled pool members affect traffic distribution and load-balancing behavior but do not create a dependency that blocks deletion of the pool object itself.

In F5 BIG-IP, a pool cannot be deleted while it is assigned to an active Virtual Server because the system enforces referential integrity between objects. The administrator must first remove the pool reference from the Virtual Server (or delete the Virtual Server) before the pool object becomes eligible for deletion.

A green circle on a pool member indicates a healthy status as reported by the assigned monitor; this health state has no bearing on whether the pool can be deleted.

Monitors are assigned to pools, not the reverse - the pool holds a reference to the monitor, so a monitor does not hold a lock on the pool that would prevent its deletion.