3351766 - How to handle HANA Alert 137: 'Restart required after configuration change'

The following alert occurred. 
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Priority: 2 (low)
Alert ID: 137
Alert Name: Restart required after configuration change.
Description: <host name>:<port> requires restart to become active.
                    Checks if services require a restart a configuration was changed.
User action: Restart services (see M_CONFIGURATION_PARAMETER_VALUES) to allow the changed configuration to become active.
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You checked configuration changes via below SQL, you observed parameter gc_unused_memory_threshold_rel was changed.
SELECT * FROM M_CONFIGURATION_PARAMETER_VALUES WHERE RESTART_REQUIRED='TRUE';

SAP HANA on Private Cloud Edition

KBA , HAN-DB-MON , SAP HANA Monitoring , Known Error