An external tool to email/phone-message me if my site is down
I have a few WordPress apps on a Ubuntu-Nginx server environment I host here in DO.
Sometimes I don't visit a site for a long time (>=1 month) and it might be that the site is down.
I'm looking for a humble payless service that will email/SMS/WhatsApp me if my website is down.
I would prefer an external zero-configuration third-party solution upon setting up an SMTP server in my Ubuntu machine and cron scheduling curl -l -L checks and email myself from my machine .
Do you know such a small third party tool?