feat(zipkin): 모니터링 시스템 zipkin 추가

user-service/build.gradle

@@ -39,6 +39,9 @@ dependencies {
     implementation 'org.springframework.cloud:spring-cloud-starter-config'
     /*implementation 'org.springframework.kafka:spring-kafka'*/
     implementation 'org.springframework.boot:spring-boot-starter-data-redis'
+    // zipkin & sleuth
+    implementation 'org.springframework.cloud:spring-cloud-starter-sleuth'
+    implementation 'org.springframework.cloud:spring-cloud-starter-zipkin:2.2.3.RELEASE'
 
     // https://mvnrepository.com/artifact/com.github.gavlyukovskiy/p6spy-spring-boot-starter
     implementation 'com.github.gavlyukovskiy:p6spy-spring-boot-starter:1.8.0'

user-service/src/main/resources/application.yml

@@ -4,6 +4,13 @@ spring:
   application:
     name: user-service
 
+  zipkin:
+    base-url: http://127.0.0.1:9411
+    enabled: true
+  sleuth:
+    sampler:
+      probability: 1.0
+
   config:
     import: optional:configserver:http://127.0.0.1:8888
   cloud: