Core Concepts

Alert Templates

Use Mustache variables to customize webhook, chat, and email alert messages

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}}`

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