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Improve docs for values in custom annotations and labels (#50346)
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The following template variables are available when expanding annotations and labels.
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| Name | Description |
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| ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| $labels | The labels from the query or condition. For example, `{{ $labels.instance }}` and `{{ $labels.job }}`. This is unavailable when the rule uses a [classic condition]({{< relref "../../alerting-rules/create-grafana-managed-rule/#single-and-multi-dimensional-rule" >}}). |
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| $values | The values of all reduce and math expressions that were evaluated for this alert rule. For example, `{{ $values.A }}`, `{{ $values.A.Labels }}` and `{{ $values.A.Value }}` where `A` is the `refID` of the expression. If the rule uses classic conditions, then a combination of the `refID` and position of the condition is used. For example, `{{ $values.A0.Value }}` or `{{ $values.A1.Value }}` |
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| $value | The value string of the alert instance. For example, `[ var='A' labels={instance=foo} value=10 ]`. |
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| Name | Description |
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| ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| $labels | The labels from the query or condition. For example, `{{ $labels.instance }}` and `{{ $labels.job }}`. This is unavailable when the rule uses a [classic condition]({{< relref "../../alerting-rules/create-grafana-managed-rule/#single-and-multi-dimensional-rule" >}}). |
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| $values | The values of all reduce and math expressions that were evaluated for this alert rule. For example, `{{ $values.A }}`, `{{ $values.A.Labels }}` and `{{ $values.A.Value }}` where `A` is the `refID` of the expression. If the rule uses classic conditions, then a combination of the `refID` and position of the condition is used. For example, `{{ $values.A0.Value }}` or `{{ $values.A1.Value }}`. If a value can return no data then it is recommended to use either `{{ $values.A }}` where the missing value will show `<no value>` or an if statement to check if `A` exists when using `{{ $values.A.Labels }}` and `{{ $values.A.Value }}`. For example, `{{ if $values.A }}{{ $values.A.Value }}{{ end }}`. |
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| $value | The value string of the alert instance. For example, `[ var='A' labels={instance=foo} value=10 ]`. |
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