Add minimal alertmanager type

type/__prometheus_alertmanager/files/alertmanager.yml.sh

@@ -0,0 +1,61 @@
+#!/bin/sh
+
+cat << EOF
+global:
+  # The smarthost and SMTP sender used for mail notifications.
+  smtp_smarthost: '${SMTP_SMARTHOST:?}'
+  smtp_from: '${SMTP_FROM:?}'
+  smtp_auth_username: '${SMTP_USER:?}'
+  smtp_auth_password: '${SMTP_PASSWORD}'
+
+# The root route on which each incoming alert enters.
+route:
+  # The labels by which incoming alerts are grouped together. For example,
+  # multiple alerts coming in for cluster=A and alertname=LatencyHigh would
+  # be batched into a single group.
+  group_by: ['alertname', 'cluster', 'service']
+
+  # When a new group of alerts is created by an incoming alert, wait at
+  # least 'group_wait' to send the initial notification.
+  # This way ensures that you get multiple alerts for the same group that start
+  # firing shortly after another are batched together on the first 
+  # notification.
+  group_wait: 30s
+
+  # When the first notification was sent, wait 'group_interval' to send a batch
+  # of new alerts that started firing for that group.
+  group_interval: 5m
+
+  # If an alert has successfully been sent, wait 'repeat_interval' to
+  # resend them.
+  repeat_interval: 3h
+
+  # A default receiver
+  receiver: admin-mails
+
+  # All the above attributes are inherited by all child routes and can 
+  # overwritten on each.
+
+  # The child route trees.
+  routes: []
+
+
+# Inhibition rules allow to mute a set of alerts given that another alert is
+# firing.
+# We use this to mute any warning-level notifications if the same alert is 
+# already critical.
+inhibit_rules:
+- source_match:
+    severity: 'critical'
+  target_match:
+    severity: 'warning'
+  # Apply inhibition if the alertname is the same.
+  equal: ['alertname', 'cluster', 'service']
+
+
+receivers:
+- name: 'admin-mails'
+  email_configs:
+  - to: '${RECEIVER_EMAIL:?}'
+
+EOF

type/__prometheus_alertmanager/manifest

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+os="$(cat "${__global:?}/explorer/os")"
+case "$os" in
+	alpine)
+		service=alertmanager
+		package=alertmanager
+		alertmanager_yml=/etc/alertmanager/alertmanager.yml
+		;;
+
+	ubuntu|debian)
+		service=prometheus-alertmanager
+		package=prometheus-alertmanager
+		alertmanager_yml=/etc/prometheus/alertmanager.yml
+		;;
+	*)
+		echo "This type does not supper $os. Exiting." >&2
+		exit 1
+		;;
+esac
+
+SMTP_SMARTHOST=$(cat "${__object:?}/parameter/smtp-smarthost")
+SMTP_FROM=$(cat "${__object:?}/parameter/smtp-from")
+SMTP_USER=$(cat "${__object:?}/parameter/smtp-user")
+SMTP_PASSWORD=$(cat "${__object:?}/parameter/smtp-password")
+export SMTP_SMARTHOST SMTP_USER SMTP_FROM SMTP_PASSWORD
+
+RECEIVER_EMAIL=$(cat "${__object:?}/parameter/receiver")
+export RECEIVER_EMAIL
+
+# Install Alertmanager.
+__package "$package"
+
+# Generate and deploy configuration
+mkdir -p "${__object:?}/files"
+"${__type:?}/files/alertmanager.yml.sh" > "${__object:?}/files/alertmanager.yml"
+
+require="__package/$package" __file "$alertmanager_yml" \
+	--source "${__object:?}/files/alertmanager.yml" \
+	--mode 0644 \
+	--onchange "service $service restart"
+
+require="__package/$package" __start_on_boot "$service"
+#require="__package/$package" __service "$service" --action start

type/__prometheus_alertmanager/parameter/required

@@ -0,0 +1,5 @@
+smtp-smarthost
+smtp-from
+smtp-user
+smtp-password
+receiver