Merge pull request #44704 from jonatan-ivanov

* pr/44704:
  Add GarbageCollectorInfo to MemoryInfo

Closes gh-44704

Author: mhalbritter

Diff for: spring-boot-project/spring-boot/src/main/java/org/springframework/boot/info/ProcessInfo.java

@@ -16,11 +16,13 @@
 
 package org.springframework.boot.info;
 
+import java.lang.management.GarbageCollectorMXBean;
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryMXBean;
 import java.lang.management.MemoryUsage;
 import java.lang.management.PlatformManagedObject;
 import java.lang.reflect.Method;
+import java.util.List;
 
 import org.springframework.util.ClassUtils;
 
@@ -178,13 +180,19 @@ public static class MemoryInfo {
 
 		private static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
 
+		private static final List<GarbageCollectorMXBean> garbageCollectorMXBeans = ManagementFactory
+			.getGarbageCollectorMXBeans();
+
 		private final MemoryUsageInfo heap;
 
 		private final MemoryUsageInfo nonHeap;
 
+		private final List<GarbageCollectorInfo> garbageCollectors;
+
 		MemoryInfo() {
 			this.heap = new MemoryUsageInfo(memoryMXBean.getHeapMemoryUsage());
 			this.nonHeap = new MemoryUsageInfo(memoryMXBean.getNonHeapMemoryUsage());
+			this.garbageCollectors = garbageCollectorMXBeans.stream().map(GarbageCollectorInfo::new).toList();
 		}
 
 		public MemoryUsageInfo getHeap() {
@@ -195,6 +203,20 @@ public MemoryUsageInfo getNonHeap() {
 			return this.nonHeap;
 		}
 
+		/**
+		 * Garbage Collector information for the process. This list provides details about
+		 * the currently used GC algorithms selected by the user or JVM ergonomics. It
+		 * might not be trivial to know the used GC algorithms since that usually depends
+		 * on the {@link Runtime#availableProcessors()} (see:
+		 * {@link ProcessInfo#getCpus()}) and the available memory (see:
+		 * {@link MemoryUsageInfo}).
+		 * @return {@link List} of {@link GarbageCollectorInfo}.
+		 * @since 3.5.0
+		 */
+		public List<GarbageCollectorInfo> getGarbageCollectors() {
+			return this.garbageCollectors;
+		}
+
 		public static class MemoryUsageInfo {
 
 			private final MemoryUsage memoryUsage;
@@ -221,6 +243,27 @@ public long getMax() {
 
 		}
 
+		public static class GarbageCollectorInfo {
+
+			private final String name;
+
+			private final long collectionCount;
+
+			GarbageCollectorInfo(GarbageCollectorMXBean garbageCollectorMXBean) {
+				this.name = garbageCollectorMXBean.getName();
+				this.collectionCount = garbageCollectorMXBean.getCollectionCount();
+			}
+
+			public String getName() {
+				return this.name;
+			}
+
+			public long getCollectionCount() {
+				return this.collectionCount;
+			}
+
+		}
+
 	}
 
 }

Diff for: spring-boot-project/spring-boot/src/test/java/org/springframework/boot/info/ProcessInfoTests.java

@@ -16,10 +16,13 @@
 
 package org.springframework.boot.info;
 
+import java.util.List;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledForJreRange;
 import org.junit.jupiter.api.condition.JRE;
 
+import org.springframework.boot.info.ProcessInfo.MemoryInfo;
 import org.springframework.boot.info.ProcessInfo.MemoryInfo.MemoryUsageInfo;
 import org.springframework.boot.info.ProcessInfo.VirtualThreadsInfo;
 
@@ -56,6 +59,12 @@ void memoryInfoIsAvailable() {
 		assertThat(nonHeapUsageInfo.getUsed()).isPositive().isLessThanOrEqualTo(nonHeapUsageInfo.getCommitted());
 		assertThat(nonHeapUsageInfo.getCommitted()).isPositive();
 		assertThat(nonHeapUsageInfo.getMax()).isEqualTo(-1);
+		List<MemoryInfo.GarbageCollectorInfo> garbageCollectors = processInfo.getMemory().getGarbageCollectors();
+		assertThat(garbageCollectors).isNotEmpty();
+		assertThat(garbageCollectors).allSatisfy((garbageCollector) -> {
+			assertThat(garbageCollector.getName()).isNotEmpty();
+			assertThat(garbageCollector.getCollectionCount()).isNotNegative();
+		});
 	}
 
 	@Test