certificate
URLs to certificate manager certificate resources that are used to authenticate connections between users and the load balancer. Currently, you may specify up to 15 certificates. Certificate manager certificates do not apply when the load balancing scheme is set to INTERNAL_SELF_MANAGED. sslCertificates and certificateManagerCertificates fields can not be defined together. Accepted format is //certificatemanager.googleapis.com/projects/{project}/locations/{location}/certificates/{resourceName} or just the self_link projects/{project}/locations/{location}/certificates/{resourceName}