Question

我使用有关CPU，RAM，磁盘使用情况等的数据创建了mysql数据库...我创建了图形但是我注意到当没有新数据时，显示最后一个值。这意味着如果我使用50％的CPU而不是关闭服务器，grafana仍将显示50％的使用率。

这是我在grafana的查询：

SELECT
  UNIX_TIMESTAMP(date) as time_sec,
  cpu as value,
  'server' as metric
FROM server

这是我在monitoring.sh中查询的方式：

INSERT INTO database 
VALUES ('$datetime', $cpu_percentage, $mem, $swap, $load1, $load5, $load15, $disk)

使用值示例：

INSERT INTO database 
VALUES ('2018-03-25 14:05:41', 9.69, 56.65, 0.00, 1.52, 1.72, 1.82, 20)

我希望在没有出现新值时有间隙，例如服务器已关闭。

有没有办法如何配置grafana来达到这种状态？这甚至可能吗？

我正在使用Grafana v5.0.3。

编辑：

"lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 0.5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "alias": "",
          "format": "time_series",
          "rawSql": "SELECT\n  UNIX_TIMESTAMP(date) as time_sec,\n  cpu as value,\n  'server' as metric\nFROM server\n\n",
          "refId": "A"
        },
        {
          "alias": "",
          "format": "time_series",
          "rawSql": "SELECT\n  UNIX_TIMESTAMP(date) as time_sec,\n  cpu as value,\n  'raspberrypi' as metric\nFROM raspberrypi\n\n",
          "refId": "B"
        },
        {
          "alias": "",
          "format": "time_series",
          "rawSql": "SELECT\n  UNIX_TIMESTAMP(date) as time_sec,\n  cpu as value,\n  'dellpc' as metric\nFROM dellpc\n\n",
          "refId": "C"
        }
      ],
      "thresholds": [
        {
          "colorMode": "critical",
          "fill": true,
          "line": true,
          "op": "gt",
          "value": 70
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "CPU usage",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "transparent": true,
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "percent",
          "label": "Usage",
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": false
        }
      ]
    },
    {
      "aliasColors": {
        "dellpc": "#0a50a1",
        "raspberrypi": "#962d82",
        "test": "#fce2de"
      },
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": null,
      "decimals": 2,
      "fill": 1,
      "gridPos": {
        "h": 11,
        "w": 12,
        "x": 12,
        "y": 0
      },
      "id": 6,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "hideEmpty": false,
        "hideZero": false,
        "max": true,
        "min": true,
        "show": true,
        "total": false,
        "values": true
      },

Answer 1

将"nullPointMode": "null"更改为"nullPointMode": "null as zero"

Answer 2

尝试以下查询

select $__timegroup(date,'24h',0) as time, cpu as value,'server' as metric
FROM server
group by $__timegroup(date,'24h',0)

Grafana - mysql中没有数据时的间隙

2 个答案: