Add peer string to ping sent log

src/core/ext/transport/chttp2/transport/chttp2_transport.cc

@@ -824,10 +824,10 @@ static const char* write_state_name(grpc_chttp2_write_state st) {
 
 static void set_write_state(grpc_chttp2_transport* t,
                             grpc_chttp2_write_state st, const char* reason) {
-  GRPC_CHTTP2_IF_TRACING(gpr_log(GPR_INFO, "W:%p %s state %s -> %s [%s]", t,
-                                 t->is_client ? "CLIENT" : "SERVER",
-                                 write_state_name(t->write_state),
-                                 write_state_name(st), reason));
+  GRPC_CHTTP2_IF_TRACING(
+      gpr_log(GPR_INFO, "W:%p %s [%s] state %s -> %s [%s]", t,
+              t->is_client ? "CLIENT" : "SERVER", t->peer_string,
+              write_state_name(t->write_state), write_state_name(st), reason));
   t->write_state = st;
   /* If the state is being reset back to idle, it means a write was just
    * finished. Make sure all the run_after_write closures are scheduled.