WebSphere can be configured to do the following before a certificate expires.

• Add messages to the message log regarding the certificate that will expire
• Send an email alerting that the certificate will expire
• Replace the certificate if it is self-signed or chained
• Delete the certificate after it has been replaced

You will navigate to Security > SSL certificate and key management > Manage certificate expiration to set up these controls. 

To configure email notifications, in the right panel of the General Properties page, select Notifications and then select Message Log. Enter the email address and email server that will be sending the email, and select OK.