Grafana：如何确定选定时间段的持续时间

Question

我找不到使用Grafana计算SLA（可用性）的正确数学公式： 我有图表显示每天停机的持续时间： 由此，我想计算SLA（例如：99.5％）。

在所选期间（过去7天）的图表上，我可以获得此数据：

• 71258是第二个停机时间的总和。我总结了（1day，max，false）
• 我需要获得所选时间段的持续时间总和（此处为7天= 604800秒）。但是怎么样？

如果我有这最后的数据，我会这样做：

  

（100％* 604800）/ 71258 = X％

     

100％ - X％=我的SLA !!

我的问题是：在Grafana中使用哪个公式来确定选定时间段的持续时间？

Answer 1

One of the database you can run behind Grafana, is Axibase Time Series Database (ATSD). It provides built-in aggregation functions that can perform SLA-type calculations, for example, to compute % of the period when the value exceeded the threshold.

• THRESHOLD_COUNT - number of violations in the period
• THRESHOLD_DURATION - cumulative duration of the violations
• THRESHOLD_PERCENT - duration divided by period

In your example, that would be THRESHOLD_PERCENT.

Here's a sample SLA report for Amazon Web Services instance: https://apps.axibase.com/chartlab/0aa34311/6/. THRESHOLD_PERCENT is visualized on the top chart.

The API request looks as follows:

{
    "queries": [{
        "startDate": "2016-02-22T00:00:00Z",
        "endDate": "2016-02-23T00:00:00Z",
        "timeFormat": "iso",
        "entity": "nurswgvml007",
        "metric": "app.response_time",
        "aggregate": {
            "types": [
                "THRESHOLD_COUNT",
                "THRESHOLD_DURATION",
                "THRESHOLD_PERCENT"
            ],
            "period": {
                "count": 1,
                "unit": "HOUR"
            },
            "threshold": {
                "max": 200
            }
        }
    }]
}

ATSD driver: https://github.com/grafana/grafana-plugins/tree/master/datasources/atsd

Disclosure: I work for Axibase.