Added monitoring, limited concurent connections (#245)

* reduced the default, and added environment override.

* Using parse is more stable and doesn't fail CI this time :P

* Added support for monitoring
This support is currently basic, but it can be improved later down the road.

* Forgot scheduler file

* Added health check

* Cargo fix

* Update cargo.lock to avoid action fails.

Co-authored-by: Geometrically <18202329+Geometrically@users.noreply.github.com>

src/models/mod.rs

@@ -4,4 +4,4 @@ pub mod notifications;
 pub mod projects;
 pub mod reports;
 pub mod teams;
-pub mod users;
+pub mod users;