chore(dsstore): resurrect `prepare_batch` entry tracepoint

apps/emqx_durable_storage/src/emqx_ds_storage_layer.erl

@@ -317,9 +317,6 @@ drop_shard(Shard) ->
 ) ->
     emqx_ds:store_batch_result().
 store_batch(Shard, Messages, Options) ->
-    ?tp(emqx_ds_storage_layer_store_batch, #{
-        shard => Shard, messages => Messages, options => Options
-    }),
     case prepare_batch(Shard, Messages, #{}) of
         {ok, CookedBatch} ->
             commit_batch(Shard, CookedBatch, Options);
@@ -334,9 +331,12 @@ store_batch(Shard, Messages, Options) ->
     [{emqx_ds:time(), emqx_types:message()}],
     batch_prepare_opts()
 ) -> {ok, cooked_batch()} | ignore | emqx_ds:error(_).
-prepare_batch(Shard, Messages = [{Time, _} | _], _Options) ->
+prepare_batch(Shard, Messages = [{Time, _} | _], Options) ->
     %% NOTE
     %% We assume that batches do not span generations. Callers should enforce this.
+    ?tp(emqx_ds_storage_layer_prepare_batch, #{
+        shard => Shard, messages => Messages, options => Options
+    }),
     %% FIXME: always store messages in the current generation
     case generation_at(Shard, Time) of
         {GenId, #{module := Mod, data := GenData}} ->
@@ -344,9 +344,6 @@ prepare_batch(Shard, Messages = [{Time, _} | _], _Options) ->
             Result =
                 case Mod:prepare_batch(Shard, GenData, Messages) of
                     {ok, CookedBatch} ->
-                        ?tp(emqx_ds_storage_layer_batch_cooked, #{
-                            shard => Shard, gen => GenId, batch => CookedBatch
-                        }),
                         {ok, #{?tag => ?COOKED_BATCH, ?generation => GenId, ?enc => CookedBatch}};
                     Error = {error, _, _} ->
                         Error