diff --git a/metropolis/pkg/logtree/grpc.go b/metropolis/pkg/logtree/grpc.go
new file mode 100644
index 0000000..3b2594d
--- /dev/null
+++ b/metropolis/pkg/logtree/grpc.go
@@ -0,0 +1,75 @@
+package logtree
+
+import "google.golang.org/grpc/grpclog"
+
+// GRPCify turns a LeveledLogger into a go-grpc compatible logger.
+func GRPCify(logger LeveledLogger) grpclog.LoggerV2 {
+	lp, ok := logger.(*leveledPublisher)
+	if !ok {
+		// Fail fast, as this is a programming error.
+		panic("Expected *leveledPublisher in LeveledLogger from supervisor")
+	}
+
+	lp2 := *lp
+	lp2.depth += 1
+
+	return &leveledGRPCV2{
+		lp: &lp2,
+	}
+}
+
+type leveledGRPCV2 struct {
+	lp *leveledPublisher
+}
+
+func (g *leveledGRPCV2) Info(args ...interface{}) {
+	g.lp.Info(args...)
+}
+
+func (g *leveledGRPCV2) Infoln(args ...interface{}) {
+	g.lp.Info(args...)
+}
+
+func (g *leveledGRPCV2) Infof(format string, args ...interface{}) {
+	g.lp.Infof(format, args...)
+}
+
+func (g *leveledGRPCV2) Warning(args ...interface{}) {
+	g.lp.Warning(args...)
+}
+
+func (g *leveledGRPCV2) Warningln(args ...interface{}) {
+	g.lp.Warning(args...)
+}
+
+func (g *leveledGRPCV2) Warningf(format string, args ...interface{}) {
+	g.lp.Warningf(format, args...)
+}
+
+func (g *leveledGRPCV2) Error(args ...interface{}) {
+	g.lp.Error(args...)
+}
+
+func (g *leveledGRPCV2) Errorln(args ...interface{}) {
+	g.lp.Error(args...)
+}
+
+func (g *leveledGRPCV2) Errorf(format string, args ...interface{}) {
+	g.lp.Errorf(format, args...)
+}
+
+func (g *leveledGRPCV2) Fatal(args ...interface{}) {
+	g.lp.Fatal(args...)
+}
+
+func (g *leveledGRPCV2) Fatalln(args ...interface{}) {
+	g.lp.Fatal(args...)
+}
+
+func (g *leveledGRPCV2) Fatalf(format string, args ...interface{}) {
+	g.lp.Fatalf(format, args...)
+}
+
+func (g *leveledGRPCV2) V(l int) bool {
+	return g.lp.V(VerbosityLevel(l)).Enabled()
+}