Deprecate ART_DATUM_GC_TOTAL_METADATA_SIZE

Bug: 191404436
Test: Observe pitot data
Change-Id: Ia8662a8a9c3fe77eb779209dc1ab2093d03770e7
diff --git a/stats/atoms.proto b/stats/atoms.proto
index a5e29b4..5fab506 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -12499,7 +12499,7 @@
 
     ART_DATUM_CLASS_VERIFICATION_COUNT = 16;
     ART_DATUM_GC_TOTAL_BYTES_ALLOCATED = 17;
-    ART_DATUM_GC_TOTAL_COLLECTION_TIME_MS = 18;
+    ART_DATUM_GC_TOTAL_METADATA_SIZE_BYTES = 18 [deprecated=true];
     ART_DATUM_GC_YOUNG_GENERATION_COLLECTION_THROUGHPUT_HISTO_MB_PER_SEC = 19;
     ART_DATUM_GC_FULL_HEAP_COLLECTION_THROUGHPUT_HISTO_MB_PER_SEC = 20;
     ART_DATUM_JIT_METHOD_COMPILE_COUNT = 21;
@@ -12509,6 +12509,7 @@
     ART_DATUM_GC_FULL_HEAP_COLLECTION_THROUGHPUT_AVG_MB_PER_SEC = 25;
     ART_DATUM_GC_YOUNG_GENERATION_TRACING_THROUGHPUT_AVG_MB_PER_SEC = 26;
     ART_DATUM_GC_FULL_HEAP_TRACING_THROUGHPUT_AVG_MB_PER_SEC = 27;
+    ART_DATUM_GC_TOTAL_COLLECTION_TIME_MS = 28;
 }
 
 // Indicates what class of thread the reported values apply to.