Merge pull request #87 from Apptive-Game-Team/feature/86

feat: expose Prometheus metrics on a separate management port

Author: dev-yunseong

build.gradle

@@ -60,6 +60,10 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-security'
     implementation 'org.springframework.boot:spring-boot-starter-oauth2-resource-server'
 
+    // Metrics
+    implementation 'org.springframework.boot:spring-boot-starter-actuator'
+    runtimeOnly 'io.micrometer:micrometer-registry-prometheus'
+
     testImplementation 'org.springframework.security:spring-security-test'
 }
 

src/main/resources/application.yml

@@ -1,6 +1,20 @@
 server:
   port: ${PORT}
 
+# Metrics run on their own port so the public app port never serves /actuator.
+# The app SecurityFilterChain does not guard the management context, so
+# MANAGEMENT_PORT must stay reachable only from the Prometheus host.
+management:
+  server:
+    port: ${MANAGEMENT_PORT:8081}
+  endpoints:
+    web:
+      exposure:
+        include: health,prometheus
+  metrics:
+    tags:
+      application: ${spring.application.name}
+
 spring:
   application:
     name: word-online-matching