[feature/#78] 부하테스트 실행 환경 구성 (#85)

- SPRING_PROFILES_ACTIVE를 .env로 토글 (평소 prod / 부하시 prod,loadtest)
- 시드 확장: 회원 100->2500, 과목 20->30
- 경량 지표 노출: actuator + micrometer-prometheus
  (tomcat threads / hikaricp connections / cpu) -> /actuator/prometheus

Author: kanghana1

.env.example

@@ -4,6 +4,9 @@
 # Docker Hub 사용자명 (앱 이미지: <DOCKER_USERNAME>/docker-springboot:latest)
 DOCKER_USERNAME=your-dockerhub-username
 
+# Spring 프로파일 (평소 prod / 부하테스트 시 prod,loadtest 로 변경하면 헤더 기반 userId 활성화)
+SPRING_PROFILES_ACTIVE=prod
+
 # MySQL
 MYSQL_ROOT_PASSWORD=change-me-root-password
 DB_NAME=course_register

build.gradle

@@ -60,6 +60,10 @@ dependencies {
 
 	// redisson
 	implementation 'org.redisson:redisson-spring-boot-starter:3.27.2'
+
+	// monitoring (부하테스트용 지표: thread pool / connection pool / cpu)
+	implementation 'org.springframework.boot:spring-boot-starter-actuator'
+	implementation 'io.micrometer:micrometer-registry-prometheus'
 }
 
 tasks.named('test') {

docker-compose.prod.yml

@@ -42,7 +42,7 @@ services:
     ports:
       - "80:8080"
     environment:
-      SPRING_PROFILES_ACTIVE: prod
+      SPRING_PROFILES_ACTIVE: ${SPRING_PROFILES_ACTIVE:-prod}
       DB_HOST: mysql
       DB_PORT: 3306
       DB_NAME: ${DB_NAME}

src/main/java/com/practice/course_registration/global/init/DataInitializer.java

@@ -50,7 +50,7 @@ public void run(String... args) {
     private void seedSubjects() {
         SubjectDay[] days = SubjectDay.values();
         List<Subject> subjects = new ArrayList<>();
-        for (int i = 1; i <= 20; i++) {
+        for (int i = 1; i <= 30; i++) {
             subjects.add(Subject.builder()
                     .subjectName("테스트과목" + i)
                     .professorName("교수" + i)

src/main/resources/application-prod.yml

@@ -43,5 +43,15 @@ server:
 app:
   seed:
     enabled: true
-    member-count: 100
-    member-password: test1234
+    member-count: 2500
+    member-password: test1234
+
+# 부하테스트용 지표 노출 (thread pool / connection pool / cpu)
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health, prometheus
+  metrics:
+    tags:
+      application: course-registration