The certificate for plesk has expired: The certificate needs to be renewed; this can be done using the 'genkey' program.

Symptoms

• Plesk is secured with Let's Encrypt certificate
• System utility certwatch sends an email alike:

  CONFIG_TEXT: From: root [mailto:root@example.com]
  To: root@server.tld
  Subject: The certificate for plesk has expired
  ################# SSL Certificate Warning ################
  Certificate for hostname 'plesk', in file (or by nickname):
  /usr/local/psa/var/certificates/cert-bnsDK3
  The certificate needs to be renewed; this can be done using the 'genkey' program.
  Browsers will not be able to correctly connect to this website using SSL until the certificate is renewed.
  Generated by certwatch(1)

Cause

False positive warning.

Resolution

Plesk renews Let's Encrypt certificates automatically via the following task in Tools & Settings > Scheduled Tasks: