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/pod.rs

@@ -0,0 +1,33 @@
+use std::sync::{RwLock, Arc};
+
+#[derive(Clone, Debug)]
+pub struct PodInfo {
+    pub pod_name: String,
+    pub node_name: String,
+    pod_id: Arc<RwLock<Option<String>>>,
+}
+
+impl PodInfo {
+    pub fn new() -> Self {
+        Self {
+            pod_name: dotenv::var("POD_NAME").unwrap_or("DEV".to_string()),
+            node_name: dotenv::var("NODE_NAME").unwrap_or("self-hosted".to_string()),
+            pod_id: Arc::new(RwLock::new(None))
+        }
+    }
+    pub fn get_id(&self) -> String {
+        {
+            let lock = self.pod_id.read().unwrap();
+            if lock.is_some() {
+                return lock.clone().unwrap();
+            }
+        }
+        let mut lock = self.pod_id.write().unwrap();
+        let id = self.generate_id();
+        lock.replace(id.clone());
+        id
+    }
+    fn generate_id(&self) -> String {
+        base64::encode(format!("{}-{}", self.node_name, self.pod_name))
+    }
+}