Changes made

backend/.env.example

@@ -37,3 +37,11 @@ SOROBAN_RPC_URL=https://soroban-testnet.stellar.org:443
 # Additional Configuration
 # Add other configuration variables as needed
 ENVIRONMENT=development
+
+# Monitoring Configuration
+# Enable/disable metrics collection (true/false)
+METRICS_ENABLED=true
+# Prometheus metrics endpoint path
+METRICS_PATH=/metrics
+# HTTP metrics endpoint path (auto-enabled by actix-web-prom)
+HTTP_METRICS_PATH=/metrics/http

backend/README.md

@@ -303,6 +303,94 @@ For questions or issues:
 
 ---
 
+## 📊 Monitoring & Observability
+
+XLMate backend includes comprehensive Prometheus metrics and Grafana dashboards for monitoring system health and performance.
+
+### Metrics Endpoints
+
+The backend exposes metrics at two endpoints:
+
+- **`/metrics`** - Custom application metrics (active games, WebSocket connections, etc.)
+- **`/metrics/http`** - HTTP request metrics (request rate, duration, status codes)
+
+### Available Metrics
+
+#### Application Metrics
+- `xlmate_active_games` - Current number of active games (Gauge)
+- `xlmate_ws_connections` - Active WebSocket connections (Gauge)
+- `xlmate_db_query_duration_seconds` - Database query latency (Histogram)
+- `xlmate_matchmaking_queue_size` - Players waiting in matchmaking queue (Gauge)
+- `xlmate_ai_requests_total` - Total AI analysis requests (Counter)
+- `xlmate_auth_events_total` - Authentication events (Counter)
+- `xlmate_game_events_total` - Game lifecycle events (Counter)
+
+#### HTTP Metrics (via actix-web-prom)
+- `xlmate_http_requests_total` - HTTP request count by method and status
+- `xlmate_http_request_duration_seconds` - HTTP request duration (Histogram)
+
+### Running with Monitoring
+
+Start the full monitoring stack with Docker Compose:
+
+```bash
+docker-compose up -d
+```
+
+This will start:
+- **PostgreSQL** on port 5432
+- **Redis** on port 6379
+- **Prometheus** on port 9090
+- **Grafana** on port 3000
+
+### Accessing Dashboards
+
+- **Prometheus**: http://localhost:9090
+- **Grafana**: http://localhost:3000
+  - Username: `admin`
+  - Password: `admin`
+- **Metrics Endpoint**: http://localhost:8080/metrics
+
+### Grafana Dashboards
+
+The Grafana instance comes pre-configured with:
+- Prometheus datasource
+- XLMate Backend Monitoring dashboard with panels for:
+  - Active Games (stat panel)
+  - WebSocket Connections (stat panel)
+  - Database Query Latency P50/P95 (time series)
+  - HTTP Request Rate (time series)
+  - Game Events Over Time (time series)
+  - AI Request Rate (time series)
+
+### Custom Queries
+
+You can query metrics directly in Prometheus or Grafana:
+
+```promql
+# Current active games
+xlmate_active_games
+
+# WebSocket connection rate
+rate(xlmate_ws_connections[5m])
+
+# 95th percentile database query latency
+histogram_quantile(0.95, rate(xlmate_db_query_duration_seconds_bucket[5m]))
+
+# HTTP error rate
+rate(xlmate_http_requests_total{status=~"5.."}[5m])
+```
+
+### Testing Metrics
+
+Run the metrics unit tests:
+
+```bash
+cargo test metrics_tests
+```
+
+---
+
 ## 📋 Quick Reference
 
 | Document | Purpose | Read Time |

backend/modules/api/Cargo.toml

@@ -40,6 +40,11 @@ st_core = { path = "../st_core", features = ["api"] }
 # For Redis Pub/Sub in WebSocket
 redis = { version = "0.24", features = ["tokio-comp", "json"] }
 
+# For Prometheus metrics
+prometheus = "0.13"
+actix-web-prom = "0.7"
+once_cell = "1.19"
+
 [dev-dependencies]
 tokio = { version = "1", features = ["full"] }
 actix-rt = "2.9"

backend/modules/api/src/ai.rs

@@ -12,6 +12,7 @@ use validator::Validate;
 
 use service::engine_service::EngineService;
 use std::env;
+use crate::metrics::increment_ai_requests;
 
 #[utoipa::path(
     post,
@@ -28,6 +29,9 @@ use std::env;
 )]
 #[post("/suggest")]
 pub async fn get_ai_suggestion(payload: Json<AiSuggestionRequest>) -> HttpResponse {
+    // Track AI request
+    increment_ai_requests("suggestion");
+
     match payload.0.validate() {
         Ok(_) => {
             let engine_path = env::var("ENGINE_PATH").unwrap_or_else(|_| "stockfish".to_string());
@@ -90,6 +94,9 @@ pub async fn get_ai_suggestion(payload: Json<AiSuggestionRequest>) -> HttpRespon
 )]
 #[post("/analyze")]
 pub async fn analyze_position(payload: Json<PositionAnalysisRequest>) -> HttpResponse {
+    // Track AI request
+    increment_ai_requests("analysis");
+
     match payload.0.validate() {
         Ok(_) => {
             let engine_path = env::var("ENGINE_PATH").unwrap_or_else(|_| "stockfish".to_string());

backend/modules/api/src/auth.rs

@@ -6,6 +6,7 @@ use uuid::Uuid;
 use dto::auth::{RegisterRequest, LoginRequest, AuthResponse, ErrorResponse, RefreshTokenRequest, RefreshResponse, LogoutResponse};
 use security::{JwtService, TokenService, TokenServiceError};
 use sea_orm::DatabaseConnection;
+use crate::metrics::increment_auth_events;
 
 /// Register a new user
 #[utoipa::path(
@@ -32,6 +33,8 @@ pub async fn register(
     }
 
     // For now, return a mock response
+    increment_auth_events("register", true);
+
     HttpResponse::Created().json(AuthResponse {
         access_token: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...".to_string(),
         refresh_token: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...".to_string(),
@@ -77,6 +80,7 @@ pub async fn login(
     let access_token = match jwt_service.generate_token(user_id, &username) {
         Ok(t) => t,
         Err(_) => {
+            increment_auth_events("login", false);
             return HttpResponse::InternalServerError().json(ErrorResponse {
                 message: "Failed to generate access token".to_string(),
                 code: "TOKEN_ERROR".to_string(),
@@ -123,6 +127,10 @@ pub async fn login(
         .finish();
 
     response.add_cookie(&cookie).ok();
+
+    // Track successful login
+    increment_auth_events("login", true);
+
     response
 }
 

backend/modules/api/src/games.rs

@@ -16,6 +16,7 @@ use validator::Validate;
 use uuid::Uuid;
 use sea_orm::DatabaseConnection;
 use service::games::GameService;
+use crate::metrics::{increment_active_games, decrement_active_games, increment_game_events};
 
 // ---------------------------------------------------------------------------
 // Helper: extract authenticated player UUID inserted by the JWT middleware.
@@ -62,10 +63,16 @@ pub async fn create_game(
     };
 
     match GameService::create_game(db.get_ref(), creator_id, payload.0).await {
-        Ok(game_dto) => HttpResponse::Created().json(json!({
-            "message": "Game created successfully",
-            "data": { "game": game_dto }
-        })),
+        Ok(game_dto) => {
+            // Track game creation metric
+            increment_active_games();
+            increment_game_events("created");
+
+            HttpResponse::Created().json(json!({
+                "message": "Game created successfully",
+                "data": { "game": game_dto }
+            }))
+        }
         Err(e) => {
             eprintln!("create_game error: {e}");
             HttpResponse::InternalServerError().json(json!({
@@ -340,10 +347,16 @@ pub async fn abandon_game(
     let game_id = id.into_inner();
 
     match GameService::abandon_game(db.get_ref(), game_id, player_id).await {
-        Ok(_) => HttpResponse::Ok().json(json!({
-            "message": "Game abandoned successfully",
-            "data": {}
-        })),
+        Ok(_) => {
+            // Track game abandonment metric
+            decrement_active_games();
+            increment_game_events("abandoned");
+
+            HttpResponse::Ok().json(json!({
+                "message": "Game abandoned successfully",
+                "data": {}
+            }))
+        }
         Err(ApiError::NotFound(_)) => HttpResponse::NotFound().json(json!({
             "message": "Game not found"
         })),
@@ -540,6 +553,10 @@ pub async fn complete_game(
     // Complete the game and update ratings
     match GameService::complete_game(db.get_ref(), game_id, result_enum.clone(), Some(rating_config)).await {
         Ok((white_new_rating, black_new_rating)) => {
+            // Track game completion metric
+            decrement_active_games();
+            increment_game_events("completed");
+
             let white_change = white_new_rating - white_old_rating;
             let black_change = black_new_rating - black_old_rating;
 

backend/modules/api/src/lib.rs

@@ -7,6 +7,10 @@ pub mod config;
 pub mod server;
 pub mod players;
 pub mod games;
+pub mod metrics;
+
+#[cfg(test)]
+mod metrics_tests;
 
 // External modules
 extern crate challenge;