vector: Distinguish different vector index build type by metrics (#9769) (#9773)

close #9770

Signed-off-by: Calvin Neo <calvinneo1995@gmail.com>

Co-authored-by: Calvin Neo <CalvinNeo@users.noreply.github.com>

Author: ti-chi-bot

dbms/src/Common/TiFlashMetrics.h

@@ -860,6 +860,11 @@ static_assert(RAFT_REGION_BIG_WRITE_THRES * 4 < RAFT_REGION_BIG_WRITE_MAX, "Inva
       Gauge,                                                                                                                        \
       F(type_build, {"type", "build"}),                                                                                             \
       F(type_view, {"type", "view"}))                                                                                               \
+    M(tiflash_vector_index_build_count,                                                                                             \
+      "Vector index build count",                                                                                                   \
+      Counter,                                                                                                                      \
+      F(type_stable, {"type", "stable"}),                                                                                           \
+      F(type_delta, {"type", "delta"}))                                                                                             \
     M(tiflash_vector_index_active_instances,                                                                                        \
       "Active Vector index instances",                                                                                              \
       Gauge,                                                                                                                        \

dbms/src/Storages/DeltaMerge/LocalIndexerScheduler.cpp

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include <Common/Exception.h>
+#include <Common/TiFlashMetrics.h>
 #include <Common/setThreadName.h>
 #include <Storages/DeltaMerge/LocalIndexerScheduler.h>
 #include <common/logger_useful.h>
@@ -194,6 +195,10 @@ void LocalIndexerScheduler::taskOnSchedule(std::unique_lock<std::mutex> &, const
 {
     for (const auto & file_id : task->user_task.file_ids)
     {
+        if (std::holds_alternative<DMFileID>(file_id))
+            GET_METRIC(tiflash_vector_index_build_count, type_stable).Increment(1);
+        else
+            GET_METRIC(tiflash_vector_index_build_count, type_delta).Increment(1);
         auto [it, inserted] = adding_index_page_id_set.insert(file_id);
         RUNTIME_CHECK(inserted);
         UNUSED(it);