Received a SSL Certificate expiry warning mail from certwatch, What should be done on this mail?

Issue

• Received a SSL Certificate expiry warning mail from certwatch, What should be done on this mail ?

<code>################# SSL Certificate Warning ################


  Certificate for hostname 'server.example.com', in file (or by nickname):
     /etc/pki/tls/certs/localhost.crt


  The certificate needs to be renewed; this can be done
  using the 'genkey' program.


  Browsers will not be able to correctly connect to this
  web site using SSL until the certificate is renewed.


 ##########################################################
                                  Generated by certwatch(1)</code>