refactor(app): better error handling

src/app/service.rs

@@ -21,22 +21,22 @@ pub fn new(
 }
 
 impl Service {
-    pub fn alert_on_threshold_violation(&self) {
+    pub fn alert_on_threshold_violation(&self) -> Result<(), Box<dyn std::error::Error>> {
         // Check for threshold violations and send alerts
         let violations = self.monitor.check_thresholds();
         for violation in violations {
             let message = self.formatter.format_violation(violation);
-            self.notifier
-                .send_notification(&message)
-                .expect("Failed to send notification");
+            self.notifier.send_notification(&message)?;
         }
+        
+        Ok(())
     }
 
-    pub fn send_all_metrics_notification(&self) {
+    pub fn send_all_metrics_notification(&self) -> Result<(), Box<dyn std::error::Error>> {
         // Send a final notification with all system information
         let summary = self.formatter.format_summary(&self.monitor.get_metrics());
-        self.notifier
-            .send_notification(&summary)
-            .expect("Failed to send final notification");
+        self.notifier.send_notification(&summary)?;
+
+        Ok(())
     }
 }