to feed any monitoring system best is to use: /api/monitor/metrics
if you enable interoperability monitoring, you should have: "iris_interop_hosts" which will have "status" (ok, Inactive etc.) per any host in any production.
you may also look into the property "Enabled" in class: Ens_Config.Item
if this is not enough, and you need your own code, than do a "user defined metric" than can be added to the /api/monitor/metrics results

when you have 2 applications, with the same namespace, and difference path you need to set "Package Name" to some (different) values for both applications. When "Package Name" is not set, the default prefix is "csp"

As InterSystems Technology is not an open source, it is not fair, in my opinion to compare the community open-source library of tools and examples to others (e.g. Linux, Apache etc.) since its not possible to use them without a valid license of a product (IRIS, Cache). As such its InterSystems motivation and also a rational should be to support this library, similar to their (massive) support for the community.