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diff --git a/health/REFERENCE.md b/health/REFERENCE.md index d1af7476..90da4102 100644 --- a/health/REFERENCE.md +++ b/health/REFERENCE.md @@ -536,12 +536,48 @@ See our [simple patterns docs](/libnetdata/simple_pattern/README.md) for more ex #### Alarm line `info` -The info field can contain a small piece of text describing the alarm or template. This will be rendered in notifications and UI elements whenever the specific alarm is in focus. An example for the `ram_available` alarm is: +The info field can contain a small piece of text describing the alarm or template. This will be rendered in +notifications and UI elements whenever the specific alarm is in focus. An example for the `ram_available` alarm is: ```yaml info: percentage of estimated amount of RAM available for userspace processes, without causing swapping ``` +info fields can contain special variables in their text that will be replaced during run-time to provide more specific +alert information. Current variables supported are: + +| variable | description | +| ---------| ----------- | +| $family | Will be replaced by the family instance for the alert (e.g. eth0) | +| $label: | Followed by a chart label name, this will replace the variable with the chart label's value | + +For example, an info field like the following: + +```yaml +info: average inbound utilization for the network interface $family over the last minute +``` + +Will be rendered on the alert acting on interface `eth0` as: + +```yaml +info: average inbound utilization for the network interface eth0 over the last minute +``` + +An alert acting on a chart that has a chart label named e.g. `target`, with a value of `https://netdata.cloud/`, +can be enriched as follows: + +```yaml +info: average ratio of HTTP responses with unexpected status over the last 5 minutes for the site $label:target +``` + +Will become: + +```yaml +info: average ratio of HTTP responses with unexpected status over the last 5 minutes for the site https://netdata.cloud/ +``` + +> Please note that variable names are case sensitive. + ## Expressions Netdata has an internal [infix expression parser](/libnetdata/eval). This parses expressions and creates an internal |