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StackState v5.1
StackState v5.1
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On this page
  • Overview
  • Rich text formatting using Markdown
  • Tags
  • Passing script data to tags with STML variables
  1. Develop
  2. Reference
  3. StackState Markup Language (STML)

Using STML

StackState Self-hosted v5.1.x

PreviousStackState Markup Language (STML)NextSTML Tags

Last updated 2 years ago

Overview

With StackState Markup Language (STML), you can create pretty formatted documents of StackState data. STML is a with extensions in the form of -like tags.

Rich text formatting using Markdown

STML is a valid superset of markdown. In other words, it's markdown plus extensions. That means that you can easily format documents with headings, bullet point lists, links and tables as you may be used to with the Markdown format. For example the following valid STML document create a table of elements to buy with links to google:

| To buy                              | Amount |
|------------------------------- -----|--------|
|[Apples](http://google.com/?q=apples)| 2      |
|[Pears](http://google.com/?q=pears)  | 5      |

Tags

STML is markdown plus HTML-like tags. Tags are StackState-specific extensions to Markdown that render in some specific way. It could be a chart, visualization, pie chart, etc.

Each tag has its unique rendering, and a set of required or optional attributes.

Tags in STML are coded in the following format:

<tag_name attribute1="literal" attribute2='{ "json": true }'>content</tag_name>

Attributes can be passed as literal values using a double or single quote. Some values can contain documents.

Not all tags display their content, but if they do, the content of a tag should be a valid STML.

Passing script data to tags with STML variables

Attribute values can be set directly with literal values, but oftentimes, it may be desirable to use data that was computed in your script. Script data can be used within STML via the use of STML variables.

Here is an example of a script passing some metric data to the data attribute of the auto-widget tag. This script uses the UI.showReport function which uses STML to format a report.

Telemetry
  .query("StackState Metrics", "name='system.load.norm' and host='host1'")
  .metricField("value")
  .start("-2h")
  .aggregation("99th percentile", "5m")
  .then { host1Load ->
    UI.showReport(
        "My report",
        // STML starts below
        """
        |# Host 1 load
        |
        | The last two hours of load on host1, aggregated per 5 minutes and by 99th percentile:
        |
        |<auto-widget data={metrics}></auto-widget>
        |
        | Thank you for watching!
        |""".stripMargin(),
        // end of STML
        [ metrics: host1Load ]
    )
  }

Notice that the third parameter of the showReport function is a map that's defined by [ metrics: host1Load ]. This map defines which variables are available to STML. In this case the variable metrics references the data host1Load.

The syntax for using such variables in STML is {NAME}, where NAME is the name of the variable containing the data. Thus, passing the metrics variable to the data variable using this syntax means that the auto-widget can use the metric to render a nice chart.

See the for an overview of all tags, their purpose and attributes.

📖
markdown based language
HTML
JSON
tag reference