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docs: minor update to OpenTSDB docs

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# Using OpenTSDB in Grafana
{{< docs-imagebox img="/img/docs/v2/add_OpenTSDB.png" max-width="14rem" >}}
Grafana ships with advanced support for OpenTSDB.
The newest release of Grafana adds additional functionality when using an OpenTSDB Data source.
## Adding the data source
1. Open the side menu by clicking the the Grafana icon in the top header.
1. Open the side menu by clicking the Grafana icon in the top header.
2. In the side menu under the `Dashboards` link you should find a link named `Data Sources`.
3. Click the `+ Add data source` button in the top header.
4. Select *OpenTSDB* from the *Type* dropdown.
> NOTE: If this link is missing in the side menu it means that your current user does not have the `Admin` role for the current organization.
3. Click the `Add new` link in the top header.
4. Select `OpenTSDB` from the dropdown.
> NOTE: If you're not seeing the `Data Sources` link in your side menu it means that your current user does not have the `Admin` role for the current organization.
Name | Description
------------ | -------------
Name | The data source name, important that this is the same as in Grafana v1.x if you plan to import old dashboards.
Default | Default data source means that it will be pre-selected for new panels.
Url | The http protocol, ip and port of you opentsdb server (default port is usually 4242)
Access | Proxy = access via Grafana backend, Direct = access directly from browser.
Version | Version = opentsdb version, either <=2.1 or 2.2
Resolution | Metrics from opentsdb may have datapoints with either second or millisecond resolution.
*Name* | The data source name. This is how you refer to the data source in panels & queries.
*Default* | Default data source means that it will be pre-selected for new panels.
*Url* | The http protocol, ip and port of you opentsdb server (default port is usually 4242)
*Access* | Proxy = access via Grafana backend, Direct = access directly from browser.
*Version* | Version = opentsdb version, either <=2.1 or 2.2
*Resolution* | Metrics from opentsdb may have datapoints with either second or millisecond resolution.
## Query editor
Open a graph in edit mode by click the title. Query editor will differ if the datasource has version <=2.1 or = 2.2. In the former version, only tags can be used to query opentsdb. But in the latter version, filters as well as tags can be used to query opentsdb. Fill Policy is also introduced in opentsdb 2.2.
> Note: While using Opentsdb 2.2 datasource, make sure you use either Filters or Tags as they are mutually exclusive. If used together, might give you weird results.
Open a graph in edit mode by click the title. Query editor will differ if the datasource has version <=2.1 or = 2.2.
In the former version, only tags can be used to query OpenTSDB. But in the latter version, filters as well as tags
can be used to query opentsdb. Fill Policy is also introduced in OpenTSDB 2.2.
![](/img/docs/v2/opentsdb_query_editor.png)
![](/img/docs/v43/opentsdb_query_editor.png)
> Note: While using OpenTSDB 2.2 datasource, make sure you use either Filters or Tags as they are mutually exclusive. If used together, might give you weird results.
### Auto complete suggestions
As soon as you start typing metric names, tag names and tag values , you should see highlighted auto complete suggestions for them.
> Note: This is required for the OpenTSDB `suggest` api to work.
As soon as you start typing metric names, tag names and tag values , you should see highlighted auto complete suggestions for them.
The autocomplete only works if the OpenTSDB suggest api is enabled.
## Templating queries
Grafana's OpenTSDB data source now supports template variable values queries. This means you can create template variables that fetch the values from OpenTSDB (for example metric names, tag names, or tag values). The query editor is also enhanced to limiting tags by metric.
Instead of hard-coding things like server, application and sensor name in you metric queries you can use variables in their place.
Variables are shown as dropdown select boxes at the top of the dashboard. These dropdowns makes it easy to change the data
being displayed in your dashboard.
Checkout the [Templating]({{< relref "reference/templating.md" >}}) documentation for an introduction to the templating feature and the different
types of template variables.
### Query variable
Grafana's OpenTSDB data source supports template variable queries. This means you can create template variables
that fetch the values from OpenTSDB. For example, metric names, tag names, or tag values.
When using OpenTSDB with a template variable of `query` type you can use following syntax for lookup.
metrics(prefix) // returns metric names with specific prefix (can be empty)
tag_names(cpu) // return tag names (i.e. keys) for a specific cpu metric
tag_values(cpu, hostname) // return tag values for metric cpu and tag key hostname
suggest_tagk(prefix) // return tag names (i.e. keys) for all metrics with specific prefix (can be empty)
suggest_tagv(prefix) // return tag values for all metrics with specific prefix (can be empty)
Query | Description
------------ | -------------
*metrics(prefix)* | Returns metric names with specific prefix (can be empty)
*tag_names(cpu)* | Return tag names (i.e. keys) for a specific cpu metric
*tag_values(cpu, hostname)* | Return tag values for metric cpu and tag key hostname
*suggest_tagk(prefix)* | Return tag names (i.e. keys) for all metrics with specific prefix (can be empty)
*suggest_tagv(prefix)* | Return tag values for all metrics with specific prefix (can be empty)
If you do not see template variables being populated in `Preview of values` section, you need to enable `tsd.core.meta.enable_realtime_ts` in the OpenTSDB server settings. Also, to populate metadata of the existing time series data in OpenTSDB, you need to run `tsdb uid metasync` on the OpenTSDB server.
If you do not see template variables being populated in `Preview of values` section, you need to enable
`tsd.core.meta.enable_realtime_ts` in the OpenTSDB server settings. Also, to populate metadata of
the existing time series data in OpenTSDB, you need to run `tsdb uid metasync` on the OpenTSDB server.
### Nested Templating
One template variable can be used to filter tag values for another template varible. Very importantly, the order of the parameters matter in tag_values function. First parameter is the metric name, second parameter is the tag key for which you need to find tag values, and after that all other dependent template variables. Some examples are mentioned below to make nested template queries work successfully.
One template variable can be used to filter tag values for another template varible. First parameter is the metric name,
second parameter is the tag key for which you need to find tag values, and after that all other dependent template variables.
Some examples are mentioned below to make nested template queries work successfully.
tag_values(cpu, hostname, env=$env) // return tag values for cpu metric, selected env tag value and tag key hostname
tag_values(cpu, hostanme, env=$env, region=$region) // return tag values for cpu metric, selected env tag value, selected region tag value and tag key hostname
Query | Description
------------ | -------------
*tag_values(cpu, hostname, env=$env)* | Return tag values for cpu metric, selected env tag value and tag key hostname
*tag_values(cpu, hostanme, env=$env, region=$region)* | Return tag values for cpu metric, selected env tag value, selected region tag value and tag key hostname
> Note: This is required for the OpenTSDB `lookup` api to work.
For details on opentsdb metric queries checkout the official [OpenTSDB documentation](http://opentsdb.net/docs/build/html/index.html)
For details on OpenTSDB metric queries checkout the official [OpenTSDB documentation](http://opentsdb.net/docs/build/html/index.html)