[Feature Request] - TCP-Handshake as a service like ping/siteMonitor to monitor non-HTTP(s) services

[DonFU1]

Description

As the ping service is using ICMP-Packages to check if a device is online and the siteMonitor service using HEAD/GET HTTP requests I wanted to implement a simple TCP-Handshake test to see if a specific port accepts connections. This way you could monitor non-HTTP(s) services using homepage.
I implemented this using the npm package tcp-ping here: #3915

Best regards

Other

No response

[shamsway]

I'd love to see this feature added.

[dsf1995cn]

It makes it convenient to monitor the status of some services that only expose TCP, such as databases.
I hope this PR can be merged into the main branch.

[ianhinder]

This would be very useful for monitoring the availability of game servers which don't expose an http interface, but use their own tcp-based protocol.