You see 'Your certificate is expired banner in Aria Operations'
Environment
Aria Operations 8.x
Resolution
Go to Control Panel -> Trusted Certificates and you will see the list of certificates Aria Operations has imported from different endpoints.
When a old certificate is replaced by a new one on the endpoint, Aria Operation also pulls a new one and the old certificate is replaced by it on the integration.
The old certificate remains in Aria Operations trust store, and 'Trusted objects' field becomes blank for these certificates.
These would have been replaced now. meaning these are not utilized anymore and can be safely deleted.
If a certificate is expired and is trusted by a endpoint new certificate can be pulled by validating connection under Adapter settings in the Integrations page. It is then safe to delete the expired certificate.