question: private void startUnsubscriptionForMonitoring ( Set < String > passiveProvidersChangeSet ) { for ( String smisProviderUri : passiveProvidersChangeSet ) { if ( _connectionFactory . unsubscribeSMIProviderConnection ( smisProviderUri ) ) { ACTIVE_SMIS_PROVIDERS_CACHE . remove ( smisProviderUri ) ; _logger . info ( "Cleared existing subscription for the passive SMI-S Provider :{}" , smisProviderUri ) ; } else { _logger . error ( "Un Subscription to the passive SMIS provider {} is failed. " + "Controller will try to un-subscribe in the next scheduled cycle" , smisProviderUri ) ; } } }
target:  Clears existing subscription for the given list of unique passive SMIS providers for Monitoring