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/health/mod.rs

@@ -0,0 +1,10 @@
+pub mod scheduler;
+pub mod pod;
+pub mod status;
+
+use lazy_static::lazy_static;
+use std::sync::atomic::AtomicBool;
+
+lazy_static!{
+    pub static ref SEARCH_READY: AtomicBool =  AtomicBool::new(false);
+}