wu-sheng commented on a change in pull request #8388:
URL: https://github.com/apache/skywalking/pull/8388#discussion_r778094412
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File path: docs/en/FAQ/v9-version-upgrade.md
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@@ -12,7 +12,7 @@ The compatibility with previous releases is as below.
3. LAL: [Extractor](../../../docs/en/concepts-and-designs/lal.md) add function
`layer`. If don't set it manual, the default layer is `GENERAL` and the logs
from `ALS` the
default layer is `mesh`.
4. Storage：add `service_id`， `short_name` and `layer` columns to table
`ServiceTraffic`， add `layer` column to table `InstanceTraffic`.
- These data would be incompatible with previous in some storage, including
H2/OpenSearch/MySQL/TiDB/InfluxDB/PostgreSQL.
+ These data would be incompatible with previous in some storage, including
H2/OpenSearch/MySQL/TiDB/InfluxDB/PostgreSQL/IoTDB.
Review comment:
```suggestion
These data would be incompatible with previous in some storage, including
H2/MySQL/TiDB/InfluxDB/PostgreSQL/IoTDB.
```
OpenSearch is a fork of ElasticSearch, it should be as same as ElasticSearch.
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