diff --git a/ui/build/ninja.go b/ui/build/ninja.go
index f5f637f..04c52a2 100644
--- a/ui/build/ninja.go
+++ b/ui/build/ninja.go
@@ -244,6 +244,9 @@
 
 			// SOONG_USE_PARTIAL_COMPILE only determines which half of the rule we execute.
 			"SOONG_USE_PARTIAL_COMPILE",
+
+			// Directory for ExecutionMetrics
+			"SOONG_METRICS_AGGREGATION_DIR",
 		}, config.BuildBrokenNinjaUsesEnvVars()...)...)
 	}
 
@@ -256,6 +259,10 @@
 		// Only set RUST_BACKTRACE for n2.
 	}
 
+	// Set up the metrics aggregation directory.
+	ctx.ExecutionMetrics.SetDir(filepath.Join(config.OutDir(), "soong", "metrics_aggregation"))
+	cmd.Environment.Set("SOONG_METRICS_AGGREGATION_DIR", ctx.ExecutionMetrics.MetricsAggregationDir)
+
 	// Print the environment variables that Ninja is operating in.
 	ctx.Verboseln("Ninja environment: ")
 	envVars := cmd.Environment.Environ()
@@ -300,6 +307,8 @@
 		}
 	}()
 
+	ctx.ExecutionMetrics.Start()
+	defer ctx.ExecutionMetrics.Finish(ctx)
 	ctx.Status.Status("Starting ninja...")
 	cmd.RunAndStreamOrFatal()
 }