In Ubuntu license in updates does not appear watchdog and neither in extensions. How to get the module?
En licencia ubuntu en actualizaciones no aparece watchdog y tampoco en extensiones. ¿Cómo conseguir el modulo?
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Regarding your question: https://support.plesk.com/hc/en-us/articles/360015594400-Ubuntu-20-04-support-in-Plesk
psa-watchdog component is not available, since it requires a major update to use TLSv1.2 or higher;
This should be easy to add since monit (the open source software behind psa-watchdog) already is at a new version. In addition, even Ubuntu 20.04 can still support NGINX (see for instance here for NGINX: https://askubuntu.com/questions/1240595/enable-tls-1-0-and-tls-1-1-on-ubuntu-20-04).