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Syncing 8.1 from main into v8.1.x branch. (#37505)

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achatterjee-grafana
2021-08-03 14:01:25 -04:00
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docs/sources/datasources/prometheus.md
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| ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Query expression` | Prometheus query expression, check out the [Prometheus documentation](http://prometheus.io/docs/querying/basics/). |
| `Legend format` | Controls the name of the time series, using name or pattern. For example `{{hostname}}` is replaced with the label value for the label `hostname`. |
| `Min step` | An additional lower limit for the [`step` parameter of Prometheus range queries](https://prometheus.io/docs/prometheus/latest/querying/api/#range-queries) and for the `$__interval` and `$__rate_interval` variables. The limit is absolute, it cannot modified by the _Resolution_ setting. |
| `Resolution` | `1/1` sets both the `$__interval` variable and the [`step` parameter of Prometheus range queries](https://prometheus.io/docs/prometheus/latest/querying/api/#range-queries) such that each pixel corresponds to one data point. For better performance, lower resolutions can be picked. `1/2` only retrieves a data point for every other pixel, and `1/10` retrieves one data point per 10 pixels. Note that both _Min time interval_ and _Min step_ limit the final value of `$__interval` and `step`. |
| `Step` | Use 'Minimum' or 'Maximum' step mode to set the lower or upper bounds respectively on the interval between data points. For example, set "minimum 1h" to hint that measurements were not taken more frequently. Use the 'Exact' step mode to set an exact interval between data points. `$__interval` and `$__rate_interval` are supported. |
| `Resolution` | `1/1` sets both the `$__interval` variable and the [`step` parameter of Prometheus range queries](https://prometheus.io/docs/prometheus/latest/querying/api/#range-queries) such that each pixel corresponds to one data point. For better performance, lower resolutions can be picked. `1/2` only retrieves a data point for every other pixel, and `1/10` retrieves one data point per 10 pixels. Note that both _Min time interval_ and _Step_ limit the final value of `$__interval` and `step`. |
| `Metric lookup` | Search for metric names in this input field. |
| `Format as` | Switch between `Table`, `Time series`, or `Heatmap`. `Table` will only work in the Table panel. `Heatmap` is suitable for displaying metrics of the Histogram type on a Heatmap panel. Under the hood, it converts cumulative histograms to regular ones and sorts series by the bucket bound. |
| `Instant` | Perform an "instant" query, to return only the latest value that Prometheus has scraped for the requested time series. Instant queries return results much faster than normal range queries. Use them to look up label sets. |