add cpu metric

src/main/java/xyz/mcutils/backend/controller/HealthController.java

@@ -2,10 +2,8 @@ package xyz.mcutils.backend.controller;
 
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
-import xyz.mcutils.backend.config.Config;
 
 import java.util.Map;
 

src/main/java/xyz/mcutils/backend/service/MetricService.java

@@ -9,10 +9,9 @@ import org.springframework.stereotype.Service;
 import xyz.mcutils.backend.common.Timer;
 import xyz.mcutils.backend.repository.MetricsRepository;
 import xyz.mcutils.backend.service.metric.Metric;
-import xyz.mcutils.backend.service.metric.impl.IntegerMetric;
-import xyz.mcutils.backend.service.metric.impl.MapMetric;
 import xyz.mcutils.backend.service.metric.metrics.RequestsPerRouteMetric;
 import xyz.mcutils.backend.service.metric.metrics.TotalRequestsMetric;
+import xyz.mcutils.backend.service.metric.metrics.process.CpuUsageMetric;
 import xyz.mcutils.backend.service.metric.metrics.process.MemoryMetric;
 
 import java.util.ArrayList;
@@ -45,6 +44,7 @@ public class MetricService {
         registerMetric(new TotalRequestsMetric());
         registerMetric(new RequestsPerRouteMetric());
         registerMetric(new MemoryMetric());
+        registerMetric(new CpuUsageMetric());
 
         // Load the metrics from Redis
         loadMetrics();

src/main/java/xyz/mcutils/backend/service/metric/Metric.java

@@ -1,7 +1,6 @@
 package xyz.mcutils.backend.service.metric;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.influxdb.annotations.Measurement;
 import com.influxdb.client.write.Point;
 import lombok.AllArgsConstructor;
 import lombok.Getter;

src/main/java/xyz/mcutils/backend/service/metric/impl/DoubleMetric.java

@@ -0,0 +1,49 @@
+package xyz.mcutils.backend.service.metric.impl;
+
+import com.influxdb.client.write.Point;
+import xyz.mcutils.backend.service.metric.Metric;
+
+public class DoubleMetric extends Metric<Double> {
+
+    public DoubleMetric(String id) {
+        super(id, 0D, false);
+    }
+
+    /**
+     * Increment the value of this metric.
+     *
+     * @param amount the amount to increment by
+     */
+    public void increment(double amount) {
+        setValue(getValue() + amount);
+    }
+
+    /**
+     * Increment the value of this metric by 1.
+     */
+    public void increment() {
+        increment(1);
+    }
+
+    /**
+     * Decrement the value of this metric.
+     *
+     * @param amount the amount to decrement by
+     */
+    public void decrement(double amount) {
+        setValue(getValue() - amount);
+    }
+
+    /**
+     * Decrement the value of this metric by 1.
+     */
+    public void decrement() {
+        decrement(1D);
+    }
+
+    @Override
+    public Point toPoint() {
+        return Point.measurement(getId())
+                .addField("value", getValue());
+    }
+}

src/main/java/xyz/mcutils/backend/service/metric/metrics/process/CpuUsageMetric.java

@@ -0,0 +1,23 @@
+package xyz.mcutils.backend.service.metric.metrics.process;
+
+import com.sun.management.OperatingSystemMXBean;
+import xyz.mcutils.backend.service.metric.impl.DoubleMetric;
+
+import java.lang.management.ManagementFactory;
+
+public class CpuUsageMetric extends DoubleMetric {
+    /**
+     * The OperatingSystemMXBean instance to get the CPU load from.
+     */
+    private static final OperatingSystemMXBean OS_BEAN = ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class);
+
+    public CpuUsageMetric() {
+        super("cpu_usage");
+    }
+
+
+    @Override
+    public void collect() {
+        this.setValue(OS_BEAN.getProcessCpuLoad() * 100);
+    }
+}

src/main/java/xyz/mcutils/backend/service/metric/metrics/process/MemoryMetric.java

@@ -1,6 +1,5 @@
 package xyz.mcutils.backend.service.metric.metrics.process;
 
-import xyz.mcutils.backend.service.metric.impl.IntegerMetric;
 import xyz.mcutils.backend.service.metric.impl.MapMetric;
 
 public class MemoryMetric extends MapMetric<String, Long> {