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docs(prometheus): rewrote and shorten the note about templates

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bergquist 2017-01-16 11:50:12 +01:00
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docs/sources/features/datasources/prometheus.md
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@ -74,6 +74,7 @@ You can also use raw queries & regular expressions to extract anything you might
### Using templated variables in queries ### Using templated variables in queries
When the `Include All` option or `Multi-Value` option is enabled, Grafana converts the labels from plain text to a regex compatible string. If your labels include special values such as `.` or `/`, you will need to use the `=~` or regex match in your Prometheus query. For example, a query for ALERTS, a template query of `label(ALERTS,instance)` and an instance value of `http://example.com` would become `ALERTS{instance=~$instance}` instead of `ALERTS{instance=$instance}`. When the `Include All` option or `Multi-Value` option is enabled, Grafana converts the labels from plain text to a regex compatible string.
Which means you have to use `=~` instead of `=` in your Prometheus queries. For example `ALERTS{instance=~$instance}` instead of `ALERTS{instance=$instance}`.
![](/img/v2/prometheus_templating.png) ![](/img/v2/prometheus_templating.png)