Add GC metric to build statistic

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BuildReportsIT.kt

@@ -73,6 +73,9 @@ class BuildReportsIT : KGPBaseTest() {
             //for non-incremental builds
             assertTrue { report.contains("Build attributes:") }
             assertTrue { report.contains("REBUILD_REASON:") }
+            //gc metrics
+            assertTrue {report.contains("GC count:")}
+            assertTrue {report.contains("GC time:")}
         }
     }
 

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/statistics/CompileStatisticsData.kt

@@ -32,6 +32,8 @@ data class CompileStatisticsData(
     //TODO think about it,time in milliseconds
     val buildTimesMetrics: Map<BuildTime, Long>,
     val performanceMetrics: Map<BuildPerformanceMetric, Long>,
+    val gcTimeMetrics: Map<String, Long>?,
+    val gcCountMetrics: Map<String, Long>?,
     val type: String = BuildDataType.TASK_DATA.name
 )
 

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/BuildMetricsService.kt

@@ -171,7 +171,7 @@ internal class TaskRecord(
     override val buildMetrics: BuildMetrics,
     override val didWork: Boolean,
     override val skipMessage: String?,
-    override val icLogLines: List<String>
+    override val icLogLines: List<String>,
 ) : BuildOperationRecord {
     override val isFromKotlinPlugin: Boolean = classFqName.startsWith("org.jetbrains.kotlin")
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/PlainTextBuildReportWriter.kt

@@ -85,6 +85,9 @@ internal class PlainTextBuildReportWriter(
         if (newLineBetweenSections) p.println()
 
         printBuildAttributes(buildMetrics.buildAttributes)
+        if (newLineBetweenSections) p.println()
+
+        printGcMetrics(buildMetrics.gcMetrics)
     }
 
     private fun printBuildTimes(buildTimes: BuildTimes) {
@@ -162,6 +165,20 @@ internal class PlainTextBuildReportWriter(
         }
     }
 
+    private fun printGcMetrics(gcMetrics: GcMetrics) {
+        val allGcMetrics = gcMetrics.asMap()
+        if (allGcMetrics.isEmpty()) return
+        p.withIndent("GC metrics:") {
+            for (gcMetric in allGcMetrics) {
+                p.println("${gcMetric.key}:")
+                p.withIndent {
+                    p.println("GC count: ${gcMetric.value.count}")
+                    p.println("GC time: ${gcMetric.value.time}")
+                }
+            }
+        }
+    }
+
     private fun printTaskOverview(build: BuildExecutionData) {
         var allTasksTimeMs = 0L
         var kotlinTotalTimeMs = 0L

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/reportDataUtil.kt

@@ -81,7 +81,9 @@ internal fun prepareData(
         kotlinVersion = kotlinVersion,
         buildUuid = uuid,
         finishTime = System.currentTimeMillis(),
-        compilerArguments = taskExecutionResult?.taskInfo?.compilerArguments?.asList() ?: emptyList()
+        compilerArguments = taskExecutionResult?.taskInfo?.compilerArguments?.asList() ?: emptyList(),
+        gcCountMetrics = buildMetrics?.gcMetrics?.asGcCountMap(),
+        gcTimeMetrics = buildMetrics?.gcMetrics?.asGcTimeMap()
     )
 }