Fix the issue of missing Last Ping data. (#13103)

Author: peachisai

docs/en/changes/changes.md

@@ -83,6 +83,7 @@
 * BanyanDB: Separate the storage configuration to an independent file: `bydb.yaml`.
 * Bump Armeria to 1.32.0 and some transitive dependencies.
 * Skip persisting metrics/record data that have been expired.
+* Fix the issue of missing Last Ping data.
 
 #### UI
 

oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/Analyzer.java

@@ -291,6 +291,7 @@ private void generateTraffic(MeterEntity entity) {
             endpointTraffic.setName(entity.getEndpointName());
             endpointTraffic.setServiceId(entity.serviceId());
             endpointTraffic.setTimeBucket(TimeBucket.getMinuteTimeBucket(System.currentTimeMillis()));
+            endpointTraffic.setLastPingTimestamp(TimeBucket.getMinuteTimeBucket(System.currentTimeMillis()));
             MetricsStreamProcessor.getInstance().in(endpointTraffic);
         }
     }