Deadmans Switch type checks

Is your feature request related to a problem? Please describe.

Uptime monitoring can be divided into roughly 2 categories

Remote Checks This is currently what checkly focuses on and is a simple check that is made from a remote server on a fixed interval and if any of these checks fail notification is sent.

Deadmanswitches These are actually the inverse, these are checks that are generated from the client and if any of these fail to report notification is sent.

These are insanely valuable for background processing or database backups where you need to verify that the job successfully completed.

See https://en.wikipedia.org/wiki/Deadman%27sswitch

Describe the solution you'd like I would love deadman switch type check added to checkly so we can consolidate our monitoring offering.

Describe alternatives you've considered

• http://healthchecks.io/ (open source self-hosted version available)
• https://deadmanssnitch.com/
• https://docs.opsgenie.com/docs/heartbeat-monitoring

Additional context

original GH issue link https://github.com/checkly/public-roadmap/issues/72