feat: implemented PrometheusMetricsModule

api/build.gradle

@@ -15,4 +15,8 @@ dependencies {
     api 'org.sql2o:sql2o:1.8.0'
     api 'com.clickhouse:clickhouse-jdbc:0.7.1'
     api 'org.lz4:lz4-java:1.8.0'
+
+    api 'io.prometheus:prometheus-metrics-core:1.3.1'
+    api 'io.prometheus:prometheus-metrics-instrumentation-jvm:1.3.1'
+    api 'io.prometheus:prometheus-metrics-exporter-httpserver:1.3.1'
 }

api/src/main/java/ru/dragonestia/msb3/api/module/PrometheusMetricsModule.java

@@ -0,0 +1,43 @@
+package ru.dragonestia.msb3.api.module;
+
+import io.prometheus.metrics.exporter.httpserver.HTTPServer;
+import io.prometheus.metrics.instrumentation.jvm.JvmMetrics;
+import lombok.Getter;
+import lombok.extern.log4j.Log4j2;
+
+import java.net.InetSocketAddress;
+
+@Log4j2
+public class PrometheusMetricsModule {
+
+    private static boolean used = false;
+
+    @Getter private static HTTPServer server;
+
+    public static synchronized void init(InetSocketAddress bindingAddress) {
+        if (used) return;
+        used = true;
+
+        try {
+            run(bindingAddress);
+            log.info("Listening web-server on http://{}:{}/metrics for Prometheus metrics", bindingAddress.getHostName(), bindingAddress.getPort());
+        } catch (Exception ex) {
+            log.error(ex, ex);
+        }
+    }
+
+    private static void run(InetSocketAddress address) throws Exception {
+        JvmMetrics.builder().register();
+
+        server = HTTPServer.builder()
+                .inetAddress(address.getAddress())
+                .port(address.getPort())
+                .buildAndStart();
+
+        registerDefaultMetrics();
+    }
+
+    private static void registerDefaultMetrics() {
+
+    }
+}

prometheus/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+services:
+  prometheus:
+    image: prom/prometheus
+    ports:
+      - '9090:9090'
+    volumes:
+      - './prometheus.yml:/etc/prometheus/prometheus.yml'
+
+  grafana:
+    image: grafana/grafana
+    ports:
+      - '9091:80'
+      - '9092:3000'
+    environment:
+      GF_SECURITY_ADMIN_USER: admin
+      GF_SECURITY_ADMIN_PASSWORD: admin

prometheus/prometheus.yml

@@ -0,0 +1,11 @@
+global:
+  scrape_interval: 5s
+  external_labels:
+    monitor: 'codelab-monitor'
+
+scrape_configs:
+  - job_name: 'msb3'
+    scrape_interval: 5s
+    metrics_path: '/metrics'
+    static_configs:
+      - targets: [ 'host.docker.internal:7500' ]