add ImpactMetrics ciStep (#654)

subprojects/gradle/cd/src/main/kotlin/com/avito/ci/BuildStepListExtension.kt

@@ -8,6 +8,7 @@ import com.avito.ci.steps.DeployStep
 import com.avito.ci.steps.DetektCheck
 import com.avito.ci.steps.FlakyReportStep
 import com.avito.ci.steps.ImpactAnalysisAwareBuildStep
+import com.avito.ci.steps.ImpactMetrics
 import com.avito.ci.steps.LintCheck
 import com.avito.ci.steps.MarkReportAsSourceForTMSStep
 import com.avito.ci.steps.TestSummaryStep
@@ -42,6 +43,9 @@ open class BuildStepListExtension(
         registerFactory(CompileUiTests::class.java) { name ->
             CompileUiTests(buildStepListName, name)
         }
+        registerFactory(ImpactMetrics::class.java) { name ->
+            ImpactMetrics(buildStepListName, name)
+        }
         registerFactory(UnitTestCheck::class.java) { name ->
             UnitTestCheck(buildStepListName, name)
         }
@@ -111,6 +115,14 @@ open class BuildStepListExtension(
         configureAndAdd("compileUiTests", action)
     }
 
+    fun impactMetrics(closure: Closure<ImpactMetrics>) {
+        configureAndAdd("impactMetrics", closure)
+    }
+
+    fun impactMetrics(action: Action<ImpactMetrics>) {
+        configureAndAdd("impactMetrics", action)
+    }
+
     fun unitTests(closure: Closure<UnitTestCheck>) {
         configureAndAdd("unitTests", closure)
     }

subprojects/gradle/cd/src/main/kotlin/com/avito/ci/steps/ImpactMetrics.kt

@@ -0,0 +1,22 @@
+package com.avito.ci.steps
+
+import com.avito.kotlin.dsl.isRoot
+import com.avito.kotlin.dsl.namedOrNull
+import org.gradle.api.Project
+import org.gradle.api.Task
+import org.gradle.api.tasks.TaskProvider
+
+class ImpactMetrics(context: String, name: String) : BuildStep(context, name) {
+
+    override fun registerTask(project: Project, rootTask: TaskProvider<out Task>) {
+        require(project.isRoot()) { failMessage("should be configured for root project") }
+
+        val impactMetricsTask = requireNotNull(project.tasks.namedOrNull("impactMetrics")) {
+            failMessage("impactMetrics task not registered for root project")
+        }
+
+        rootTask.configure { it.dependsOn(impactMetricsTask) }
+    }
+
+    private fun failMessage(reason: String): String = "Failed to setup ImpactMetrics: $reason"
+}