Like? What other ways please?
Locally, munin is what I've been using for around 20 years. It keeps sensitive information at your server, not distributed to a 3rd party.
Externally, just use uptime monitors, such as hetrixtools, nodequery, uptimerobot and any number of other free options available at your favourite search engine.
[I still class 2GB as a medium size VPS (especially with 2 cores); 512MB for VPN and 1GB for a number of static sites.
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