system.dashboards

包含 /dashboard 页面（可通过 HTTP 接口访问）使用的查询，可用于监控和故障排查。

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描述

包含可通过 HTTP 接口 访问的 /dashboard 页面所使用的查询。 该表可用于监控和故障排查。仪表盘中的每个图表在该表中都对应一行。

/dashboard 页面不仅可以渲染来自 system.dashboards 的查询，还可以渲染来自任何具有相同 schema 的表的查询。 这可用于创建自定义仪表盘。

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列

• dashboard (String) — 仪表盘名称。
• title (String) — 图表标题。
• query (String) — 用于获取要显示数据的查询。

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示例

SELECT *
FROM system.dashboards
WHERE title ILIKE '%CPU%'

Row 1:
──────
dashboard: overview
title:     CPU Usage (cores)
query:     SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUVirtualTimeMicroseconds) / 1000000
FROM system.metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}

Row 2:
──────
dashboard: overview
title:     CPU Wait
query:     SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(ProfileEvent_OSCPUWaitMicroseconds) / 1000000
FROM system.metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32}
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}

Row 3:
──────
dashboard: overview
title:     OS CPU Usage (Userspace)
query:     SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
FROM system.asynchronous_metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSUserTimeNormalized'
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}

Row 4:
──────
dashboard: overview
title:     OS CPU Usage (Kernel)
query:     SELECT toStartOfInterval(event_time, INTERVAL {rounding:UInt32} SECOND)::INT AS t, avg(value)
FROM system.asynchronous_metric_log
WHERE event_date >= toDate(now() - {seconds:UInt32}) AND event_time >= now() - {seconds:UInt32} AND metric = 'OSSystemTimeNormalized'
GROUP BY t
ORDER BY t WITH FILL STEP {rounding:UInt32}