Spectrum is integrated with CA Performance Center as a data source. When a device is placed in to the specific Spectrum group it is pushed out to CA Performance Center (depending on the poll interval set in Spectrum One-Click). If a device is removed from Spectrum integration group it does not remove the device from CA Performance Center.
Content CA Performance Center r2.3.3 and Spectrum 9.x.
When a device is removed from Spectrum integration folder using One-Click, however the device is not removed from CA Performance Center. Historical data is kept and the polling of the device continues as normal.
This is working as designed and a device is not deleted from CA Performance center.