feat: Add labels template and improve error diagnostics - #22
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Add an optional labels template field to customize how alert labels are converted to ntfy tags. When configured, the template renders alert labels and splits the output by comma to produce individual tags. If not specified, the existing default behavior (key = value format) is preserved. Include a set of template helper functions (split, join, trim, lower, upper, capitalize, contains, hasPrefix, hasSuffix, replace, printf) available in all templates. Include the ntfy response body in forwarding error messages for easier debugging of rejected requests. Fix unquoted yaml struct tag on the Headers field.
Pass the full templateContext (Alert + Payload) to the labels template,
consistent with how title, description, and headers templates are rendered.
This makes .Status, .Labels, and .Annotations available in the labels
template, enabling patterns like emoji selection based on alert status:
{{- if eq .Status "firing" -}}
{{- with index .Labels "emoji" -}}{{ . }}{{- else -}}rotating_light{{- end -}}
{{- else -}}white_check_mark{{- end -}}
Existing labels templates must update bare . range iterations to .Labels.
wrenix
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Jun 23, 2026
| allowedTopicRegex = regexp.MustCompile(`^[-_A-Za-z0-9]{1,64}$`) | ||
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| // TemplateFuncs contains custom functions available in templates. | ||
| TemplateFuncs = template.FuncMap{ |
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Maybe we should use sprig instatt of develop the functio map on this own, see #25
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Add an optional
labelstemplate field to customize how alert labels are converted to ntfy tags. When not configured, the existing default behavior is preserved.Also adds template helper functions (
split,join,trim,lower,upper,capitalize,contains,hasPrefix,hasSuffix,replace,printf) available in all templates, and includes the ntfy response body in forwarding error messages for easier debugging.To filter or transform labels: