sentry/config/clickhouse/dist_config.xml

<yandex>
    <max_server_memory_usage_to_ram_ratio>0.3</max_server_memory_usage_to_ram_ratio>

    <remote_servers>
        <cluster_one_sh>
            <shard>
                <replica>
                    <host>localhost</host>
                    <port>9000</port>
                </replica>
            </shard>
        </cluster_one_sh>
    </remote_servers>

    <macros>
        <shard>1</shard>
        <replica>1</replica>
    </macros>

</yandex>