[DBM Doc] Document single_endpoint_mode for ClickHouse Cloud per-node metrics

[pierreln-dd]

Confidence: AUTO

Source PR: DataDog/integrations-core#24509

What changed:
The ClickHouse integration README now documents a new configuration option single_endpoint_mode for ClickHouse Cloud deployments that sit behind a single load-balanced endpoint. When enabled (requires Agent 7.83.0+), this tells the Agent to query system-table metrics across all nodes using clusterAllReplicas() and tag each series with clickhouse_node, ensuring accurate per-node cumulative counter metrics.

Why:
Without this setting, the Agent may hit different nodes on each collection cycle, producing inaccurate values for cumulative per-node counters like clickhouse.query.failed.count since the counter isn't read from the same source consistently.

Edits:

• Add documentation of the single_endpoint_mode configuration option and its purpose to the ClickHouse setup page

[github-actions]

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Modified Files

• https://docs-staging.datadoghq.com/pierreln-dd/dbm-doc-clickhouse-24509/database_monitoring/setup_clickhouse/

[datadog-official]

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