Alert Templates

Templates define the body and subject sent by triggers. Kener uses Mustache rendering.

Canonical alert variables

Variable
`{{alert_id}}`
`{{alert_name}}`
`{{alert_for}}`
`{{alert_value}}`
`{{alert_status}}`
`{{alert_severity}}`
`{{alert_message}}`
`{{alert_source}}`
`{{alert_timestamp}}`
`{{alert_cta_url}}`
`{{alert_cta_text}}`
`{{alert_incident_id}}`
`{{alert_incident_url}}`
`{{alert_failure_threshold}}`
`{{alert_success_threshold}}`
`{{is_resolved}}`
`{{is_triggered}}`

{{alert_name}} is the tag of the monitor the alert fired for. The shipped templates build their headline as Alert {{alert_name}} for {{alert_for}} {{alert_value}} {{alert_status}} at {{alert_timestamp}}. Any trigger created before this change whose stored template still uses a bare {{alert_name}} as a headline now shows only the tag there. The old defaults did this in four places: the email subject, the email heading, the Discord embed title, and the Slack section text. Paste the headline string wherever you want the full headline back.

Canonical site variables

Variable
`{{site_url}}`
`{{site_name}}`
`{{site_logo_url}}`
`{{colors_up}}`
`{{colors_down}}`
`{{colors_degraded}}`
`{{colors_maintenance}}`

Mustache patterns

Basic interpolation:

{{alert_name}}

Conditional sections:

{{#is_triggered}}TRIGGERED{{/is_triggered}}{{#is_resolved}}RESOLVED{{/is_resolved}}

Runtime default templates

Default templates are defined in:

webhook: src/lib/server/templates/webhook_alert_template.ts
discord: src/lib/server/templates/discord_alert_template.ts
slack: src/lib/server/templates/slack_alert_template.ts
email: src/lib/server/templates/email_alert_template.ts

Secret interpolation

Use $VAR_NAME (not {{env.VAR_NAME}}) for secrets.

Authorization: Bearer $API_TOKEN

Troubleshooting

Variables show empty: variable not present for that event
Conditional block not rendering: verify section syntax and boolean variable name
Secrets not replaced: confirm env var exists in runtime environment