diff --git a/ui/build/config.go b/ui/build/config.go
index 7370627..cd6d549 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -345,12 +345,7 @@
 		return
 	}
 
-	b := &smpb.BuildConfig{
-		ForceUseGoma: proto.Bool(config.ForceUseGoma()),
-		UseGoma:      proto.Bool(config.UseGoma()),
-		UseRbe:       proto.Bool(config.UseRBE()),
-	}
-	ctx.Metrics.BuildConfig(b)
+	ctx.Metrics.BuildConfig(buildConfig(config))
 
 	s := &smpb.SystemResourceInfo{
 		TotalPhysicalMemory: proto.Uint64(config.TotalRAM()),
@@ -359,6 +354,16 @@
 	ctx.Metrics.SystemResourceInfo(s)
 }
 
+func buildConfig(config Config) *smpb.BuildConfig {
+	return &smpb.BuildConfig{
+		ForceUseGoma:    proto.Bool(config.ForceUseGoma()),
+		UseGoma:         proto.Bool(config.UseGoma()),
+		UseRbe:          proto.Bool(config.UseRBE()),
+		BazelAsNinja:    proto.Bool(config.UseBazel()),
+		BazelMixedBuild: proto.Bool(config.bazelBuildMode() == mixedBuild),
+	}
+}
+
 // getConfigArgs processes the command arguments based on the build action and creates a set of new
 // arguments to be accepted by Config.
 func getConfigArgs(action BuildAction, dir string, ctx Context, args []string) []string {
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 7b14c47..7d4c76b 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -26,7 +26,10 @@
 	"testing"
 
 	"android/soong/ui/logger"
+	smpb "android/soong/ui/metrics/metrics_proto"
 	"android/soong/ui/status"
+
+	"github.com/golang/protobuf/proto"
 )
 
 func testContext() Context {
@@ -995,3 +998,111 @@
 		})
 	}
 }
+
+func TestBuildConfig(t *testing.T) {
+	tests := []struct {
+		name                string
+		environ             Environment
+		useBazel            bool
+		expectedBuildConfig *smpb.BuildConfig
+	}{
+		{
+			name:    "none set",
+			environ: Environment{},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "force use goma",
+			environ: Environment{"FORCE_USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use goma",
+			environ: Environment{"USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use rbe",
+			environ: Environment{"USE_RBE=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:     "use bazel as ninja",
+			environ:  Environment{},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "bazel mixed build",
+			environ: Environment{"USE_BAZEL_ANALYSIS=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+		{
+			name: "all set",
+			environ: Environment{
+				"FORCE_USE_GOMA=1",
+				"USE_GOMA=1",
+				"USE_RBE=1",
+				"USE_BAZEL_ANALYSIS=1",
+			},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			c := &configImpl{
+				environ:  &tc.environ,
+				useBazel: tc.useBazel,
+			}
+			config := Config{c}
+			actualBuildConfig := buildConfig(config)
+			if expected := tc.expectedBuildConfig; !proto.Equal(expected, actualBuildConfig) {
+				t.Errorf("Expected build config != actual build config: %#v != %#v", *expected, *actualBuildConfig)
+			}
+		})
+	}
+}
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index fc2cfa4..1063337 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -433,9 +433,14 @@
 }
 
 type BuildConfig struct {
-	UseGoma              *bool    `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
-	UseRbe               *bool    `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
-	ForceUseGoma         *bool    `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	UseGoma      *bool `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
+	UseRbe       *bool `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
+	ForceUseGoma *bool `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	// Whether the Bazel is acting as the Ninja executor for this build.
+	BazelAsNinja *bool `protobuf:"varint,4,opt,name=bazel_as_ninja,json=bazelAsNinja" json:"bazel_as_ninja,omitempty"`
+	// Whether build is occurring in a mixed build mode, where Bazel maintains the
+	// definition and build of some modules in cooperation with Soong.
+	BazelMixedBuild      *bool    `protobuf:"varint,5,opt,name=bazel_mixed_build,json=bazelMixedBuild" json:"bazel_mixed_build,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -487,6 +492,20 @@
 	return false
 }
 
+func (m *BuildConfig) GetBazelAsNinja() bool {
+	if m != nil && m.BazelAsNinja != nil {
+		return *m.BazelAsNinja
+	}
+	return false
+}
+
+func (m *BuildConfig) GetBazelMixedBuild() bool {
+	if m != nil && m.BazelMixedBuild != nil {
+		return *m.BazelMixedBuild
+	}
+	return false
+}
+
 type SystemResourceInfo struct {
 	// The total physical memory in bytes.
 	TotalPhysicalMemory *uint64 `protobuf:"varint,1,opt,name=total_physical_memory,json=totalPhysicalMemory" json:"total_physical_memory,omitempty"`
@@ -990,92 +1009,94 @@
 }
 
 var fileDescriptor_6039342a2ba47b72 = []byte{
-	// 1380 bytes of a gzipped FileDescriptorProto
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 }
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 91d8dd9..b284bf9 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -116,6 +116,13 @@
   optional bool use_rbe = 2;
 
   optional bool force_use_goma = 3;
+
+  // Whether the Bazel is acting as the Ninja executor for this build.
+  optional bool bazel_as_ninja = 4;
+
+  // Whether build is occurring in a mixed build mode, where Bazel maintains the
+  // definition and build of some modules in cooperation with Soong.
+  optional bool bazel_mixed_build = 5;
 }
 
 message SystemResourceInfo {