cannot access instance via SSH after unplanned reboot

Summary:

Hello, I received email on August 21 that "instance reboot detected and the error has been corrected and our monitoring indicates these instance(s) are now in a healthy state."

But SSH connection to this instance times out and also it is not responding to ping.

Reference Number: CN-894110

Tenant ID: ocid1.tenancy.oc1..aaaaaaaapdnwk7ukorr77ca7ibwkqdqywboeg6iszxbitnaahrwl3ebok33q