Add basic metrics + GET /metrics route

pom.xml

@@ -79,6 +79,11 @@
             <artifactId>vertx-redis-client</artifactId>
             <version>3.3.0</version>
         </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-dropwizard-metrics</artifactId>
+            <version>3.3.0</version>
+        </dependency>
 
         <!-- Google Libs -->
         <dependency>

src/main/java/net/frozenorb/apiv3/APIv3.java

@@ -37,6 +37,7 @@ import net.frozenorb.apiv3.handler.AuthorizationHandler;
 import net.frozenorb.apiv3.handler.MetricsHandler;
 import net.frozenorb.apiv3.model.*;
 import net.frozenorb.apiv3.route.GETDumpsType;
+import net.frozenorb.apiv3.route.GETMetrics;
 import net.frozenorb.apiv3.route.GETWhoAmI;
 import net.frozenorb.apiv3.route.accessTokens.DELETEAccessTokensId;
 import net.frozenorb.apiv3.route.accessTokens.GETAccessTokens;
@@ -358,6 +359,7 @@ public final class APIv3 extends AbstractVerticle {
         http.post("/users/:userId/verifyTotp").handler(new POSTUsersIdVerifyTotp());
 
         http.get("/dumps/:dumpType").handler(new GETDumpsType());
+        http.get("/metrics").handler(new GETMetrics());
         http.get("/whoami").handler(new GETWhoAmI());
 
         int port = Integer.parseInt(config.getProperty("http.port"));

src/main/java/net/frozenorb/apiv3/Main.java

@@ -1,6 +1,8 @@
 package net.frozenorb.apiv3;
 
 import io.vertx.core.Vertx;
+import io.vertx.core.VertxOptions;
+import io.vertx.ext.dropwizard.DropwizardMetricsOptions;
 
 final class Main {
 
@@ -8,7 +10,7 @@ final class Main {
         System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "error");
         System.setProperty("org.slf4j.simpleLogger.showThreadName", "false");
         System.setProperty("vertx.logger-delegate-factory-class-name", "io.vertx.core.logging.SLF4JLogDelegateFactory");
-        Vertx.vertx().deployVerticle(new APIv3());
+        Vertx.vertx(new VertxOptions().setMetricsOptions(new DropwizardMetricsOptions().setEnabled(true))).deployVerticle(new APIv3());
     }
 
 }

src/main/java/net/frozenorb/apiv3/route/GETMetrics.java

@@ -0,0 +1,18 @@
+package net.frozenorb.apiv3.route;
+
+import io.vertx.core.Handler;
+import io.vertx.core.json.JsonObject;
+import io.vertx.ext.dropwizard.MetricsService;
+import io.vertx.ext.web.RoutingContext;
+import net.frozenorb.apiv3.APIv3;
+
+public final class GETMetrics implements Handler<RoutingContext> {
+
+	public void handle(RoutingContext ctx) {
+		MetricsService metricsService = MetricsService.create(APIv3.getVertxInstance());
+		JsonObject metrics = metricsService.getMetricsSnapshot(APIv3.getVertxInstance());
+
+		APIv3.respondJson(ctx, 200, metrics);
+	}
+
+}