public static boolean isHeartbeatEvent(SourceRecord record) {
        Schema valueSchema = record.valueSchema();
        return valueSchema != null
                && SCHEMA_HEARTBEAT_EVENT_KEY_NAME.equalsIgnoreCase(valueSchema.name());
    }
Return the timestamp when the change event is fetched in {@link DebeziumReader}.

<p>The field `ts_ms` in {@link SourceRecord} data struct is the time when the record fetched
by debezium reader, use it as the process time in Source.</p>
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/utils/RecordUtils.java