Templates

Templates can be assigned to a single or a group of rules and can contain any kind of text. There is also a default template which is used for any rule that isn't associated with a template. This template can be found under Alert Templates page and can be edited. It also has an option revert it back to its default content.

The template-parser understands if and foreach controls and replaces certain placeholders with information gathered about the alert.

Syntax

Controls:

Placeholders:

Placeholders are special variables that if used within the template will be replaced with the relevant data, I.e:

The device %hostname has been up for %uptime seconds would result in the following The device localhost has been up for 30344 seconds.

Placeholders can be used within the subjects for templates as well although %faults is most likely going to be worthless.

NOTE: Placeholder names which are contained within another need to be ordered correctly. As an example:

Limit: %value.sensor_limit / %value.sensor_limit_low

Should be done as:

Limit: %value.sensor_limit_low / %value.sensor_limit

The Default Template is a 'one-size-fit-all'. We highly recommend defining your own templates for your rules to include more specific information.

Examples

Default Template:

%title
Severity: %severity
{if %state == 0}Time elapsed: %elapsed{/if}
Timestamp: %timestamp
Unique-ID: %uid
Rule: {if %name}%name{else}%rule{/if}
{if %faults}Faults:
{foreach %faults}  #%key: %value.string{/foreach}{/if}
Alert sent to: {foreach %contacts}%value <%key> {/foreach}

Ports Utilization Template:

%title
Device Name: %sysName
Severity: %severity
{if %state == 0}Time elapsed: %elapsed{/if}
Timestamp: %timestamp
Rule: {if %name}%name{else}%rule{/if}
{if %faults}
{foreach %faults}
Device: %value.sysname
Physical Interface: %value.ifDescr
Interface Description: %value.ifAlias
Interface Speed in Bits: %value.ifSpeed
Inbound Utilization: {calc (((%value.ifInOctets_rte8)/%value.ifSpeed)100)}%
Outbound Utilization: {calc (((%value.ifOutOctets_rate8)/%value.ifSpeed)100)}%
{/foreach}
{/if}

Conditional formatting example, will display a link to the host in email or just the hostname in any other transport:

{if %transport == mail}<a href="https://my.librenms.install/device/device=%hostname/">%hostname</a>
{else}
%hostname
{/if}

Note the use of double-quotes. Single quotes (') in templates will be escaped (replaced with \') in the output and should therefore be avoided.

Included

We include a few templates for you to use, these are specific to the type of alert rules you are creating. For example if you create a rule that would alert on BGP sessions then you can assign the BGP template to this rule to provide more information.

The included templates apart from the default template are: