In health monitoring, the data collection status displays as Red status during the Maintenance

[SAPSupport]

The system/service has planned to be restarted and a maintenance event has been created in the Event Calender in Business Service Management for the service/system.

However, the data collection status in the Health Monitoring still displays as "red status" with the message "The service/system did not send data within the last 2 hours." during the maintenance period

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[SAPSupport · Accepted solution]

This is an expected behavior as documented in the following user guide.
Only the event action will be suspended during the maintenance and disruptions. 
The data collection status will still be updated in the Health Monitoring

• https://support.sap.com/en/alm/sap-cloud-alm/operations/expert-portal/business-service-management.ht...
  
  Integration with SAP Cloud ALM Monitoring 
  
  Business Service Management forwards upcoming and ongoing cloud service or system status events (disruption, degradation, maintenance) to the SAP Cloud ALM monitoring applications.  The SAP Cloud ALM monitoring applications visualize the current status of the cloud service. They react as follows to ongoing status events: 
  
  
  • Health Monitoring will suppress event actions (create alert, send mail, create ticket, start operation flow) during maintenances and disruptions.