Fix unknown metadata in L2 aggregate worker

Author: weixiang

docs/en/changes/changes.md

@@ -106,6 +106,7 @@
 * BanyanDB: fix when setting `@BanyanDB.TimestampColumn`, the column should not be indexed.
 * OAP Self Observability: make Trace analysis metrics separate by label `protocol`, add Zipkin span dropped metrics.
 * BanyanDB: Move data write logic from BanyanDB Java Client to OAP and support observe metrics for write operations.
+* Fix unknown metadata in L2 aggregate worker.
 
 #### UI
 

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/worker/MetricsPersistentWorker.java

@@ -29,6 +29,7 @@
 import org.apache.skywalking.oap.server.core.analysis.TimeBucket;
 import org.apache.skywalking.oap.server.core.analysis.data.MergableBufferedData;
 import org.apache.skywalking.oap.server.core.analysis.data.ReadWriteSafeCache;
+import org.apache.skywalking.oap.server.core.analysis.meter.Meter;
 import org.apache.skywalking.oap.server.core.analysis.metrics.Metrics;
 import org.apache.skywalking.oap.server.core.exporter.ExportEvent;
 import org.apache.skywalking.oap.server.core.status.BootingStatus;
@@ -292,6 +293,9 @@ private void prepareFlushDataToStorage(List<Metrics> metricsList,
     }
 
     private void nextWorker(Metrics metrics) {
+        if (metrics instanceof Meter) {
+            ((Meter) metrics).initMeta(model.getName(), model.getScopeId());
+        }
         nextAlarmWorker.ifPresent(nextAlarmWorker -> nextAlarmWorker.in(metrics));
         nextExportWorker.ifPresent(
             nextExportWorker -> nextExportWorker.in(new ExportEvent(metrics, ExportEvent.EventType.TOTAL)));