Currently there is no way to check the history of maintenance for your hosts.
Without historical visibility, it becomes challenging to:

• Verify whether alerts were suppressed due to maintenance
• Perform root cause analysis during incident reviews
• Provide evidence during audit and compliance checks
• Maintain traceability of operational decisions

Hopefully, the following information would be present in the maintenance history:

• Host(s) or host group(s) under maintenance
• Maintenance start and end time
• Maintenance type (with/without data collection)