add prometheus integration.

apollo-common/pom.xml

@@ -60,5 +60,15 @@
             <groupId>commons-lang</groupId>
             <artifactId>commons-lang</artifactId>
         </dependency>
+
+        <!-- Micrometer core dependecy -->
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+        </dependency>
     </dependencies>
 </project>

apollo-common/src/main/java/com/ctrip/framework/apollo/common/controller/WebMvcConfig.java

 package com.ctrip.framework.apollo.common.controller;
 
+import java.util.List;
 import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
 import org.springframework.boot.web.server.MimeMappings;
 import org.springframework.boot.web.server.WebServerFactoryCustomizer;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.web.PageableHandlerMethodArgumentResolver;
-import org.springframework.http.MediaType;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
-import java.util.List;
-
 @Configuration
 public class WebMvcConfig implements WebMvcConfigurer, WebServerFactoryCustomizer<TomcatServletWebServerFactory> {
 
@@ -29,7 +27,6 @@ public class WebMvcConfig implements WebMvcConfigurer, WebServerFactoryCustomize
   @Override
   public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
     configurer.favorPathExtension(false);
-    configurer.ignoreAcceptHeader(true).defaultContentType(MediaType.APPLICATION_JSON_UTF8);
   }
 
   @Override

apollo-common/src/main/resources/application.properties

@@ -17,3 +17,5 @@ server.max-http-header-size=10240
 management.endpoints.web.base-path=/
 logging.file.max-size=50MB
 logging.file.max-history=10
+
+management.endpoints.web.exposure.include=info,health,metrics,prometheus

apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/configuration/AuthConfiguration.java

@@ -271,7 +271,7 @@ public class AuthConfiguration {
       http.csrf().disable();
       http.headers().frameOptions().sameOrigin();
       http.authorizeRequests()
-          .antMatchers("/openapi/**", "/vendor/**", "/styles/**", "/scripts/**", "/views/**", "/img/**").permitAll()
+          .antMatchers("/prometheus/**","/metrics/**","/openapi/**", "/vendor/**", "/styles/**", "/scripts/**", "/views/**", "/img/**").permitAll()
           .antMatchers("/**").hasAnyRole(USER_ROLE);
       http.formLogin().loginPage("/signin").permitAll().failureUrl("/signin?#/error").and().httpBasic();
       SimpleUrlLogoutSuccessHandler urlLogoutHandler = new SimpleUrlLogoutSuccessHandler();

apollo-portal/src/main/resources/application.yml

@@ -22,6 +22,6 @@ logging:
 management:
   health:
     status:
-      order: DOWN, OUT_OF_SERVICE, UNKNOWN, UP 
+      order: DOWN, OUT_OF_SERVICE, UNKNOWN, UP