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After we refresh it, it will showing the data:

<@U046ATGEWM7> Are you using ClickHouse queries in dashboards? Once you start seeing that data - does it get into `No Data` state again?

<@U046ATGEWM7>  what is the shardCount and replicaCount of clickhouse you are using? `replicaCount` has to be 1. `v0.12.0` only supports multiple shards and not multiple replicas of clickhouse. The data disappearing issue could be due to multiple replicas if configured

Yes <@U01HWQ1RTC2> - We have made 2 replicas of ClickHouse.

We made replica count to 1 and it is working fine.

But question is there, let's say somehow of one of the shard is crashed then how we can recover that shard data <@U01HWQ1RTC2>?

<@U046ATGEWM7> replicas is the answer for that unless you backup clickhouse data. We shall be releasing support for replication soon

okay thanks for the information <@U01HWQ1RTC2>