Pushover w/ AlertManager

I’m using Pushover’s (generous) 30-day trial. IIUC thereafter (for personal use) the app’s $5 for a perpetual license. That seems very reasonable to me.

I find Prometheus’ documentation “light”. Everything’s there but the docs feel oriented to the power|frequent user. I use Prometheus infrequently and struggle to understand the docs.

The AlertManager configuration for Pushover is ok but I struggled to understand the reference to (Golang) templates:

# Notification title.
[ title: <tmpl_string> | default = '{{ template "pushover.default.title" . }}' ]

# Notification message.
[ message: <tmpl_string> | default = '{{ template "pushover.default.message" . }}' ]

# A supplementary URL shown alongside the message.
[ url: <tmpl_string> | default = '{{ template "pushover.default.url" . }}' ]

I’m familiar with the Go’s templating but I was unclear how to interpret these configuration references. As I thought it, I assumed these must reference default templates (shipped with AlertManager) and found these here:

{{ define "pushover.default.title" }}{{ template "__subject" . }}{{ end }}
{{ define "pushover.default.message" }}{{ .CommonAnnotations.SortedPairs.Values | join " " }}
{{ if gt (len .Alerts.Firing) 0 }}
Alerts Firing:
{{ template "__text_alert_list" .Alerts.Firing }}
{{ end }}
{{ if gt (len .Alerts.Resolved) 0 }}
Alerts Resolved:
{{ template "__text_alert_list" .Alerts.Resolved }}
{{ end }}
{{ end }}
{{ define "pushover.default.url" }}{{ template "__alertmanagerURL" . }}{{ end }}

Next step is to work out how to configure AlertManager to use just the alertname label for the Pushover notification title!

• Prometheus
• Alertmanager
• Pushover