Add recipe for deploying Alertmanager

Vagrantfile

@@ -83,7 +83,8 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     }
 
     chef.run_list = [
-      'recipe[prometheus::default]'
+      'recipe[prometheus::default]',
+      'recipe[prometheus::alertmanager]'
     ]
   end
 end

attributes/default.rb

@@ -184,3 +184,37 @@
 
 # Path to static asset directory, available at /user.
 default['prometheus']['flags']['web.user-assets']                                         = ''
+
+# Location of Alertmanager binary
+default['prometheus']['alertmanager']['binary']                                           = "#{node['prometheus']['dir']}/alertmanager"
+
+# Alertmanager version to build
+default['prometheus']['alertmanager']['version']                                          = '0.0.4'
+
+# Alertmanager source repository.
+default['prometheus']['alertmanager']['git_repository']                                   = 'https://github.com/prometheus/alertmanager.git'
+
+# Alertmanager source repository git reference.  Defaults to version tag.  Can
+# also be set to a branch or master.
+default['prometheus']['alertmanager']['git_revision']                                     = node['prometheus']['alertmanager']['version']
+
+# Alertmanager configuration file name.
+default['prometheus']['alertmanager']['config.file']                                      = "#{node['prometheus']['dir']}/alertmanager.conf"
+
+# Alertmanager configuration chef template name.
+default['prometheus']['alertmanager']['config_cookbook_name']                             = 'prometheus'
+
+# Alertmanager custom configuration cookbook.  Use this if you'd like to bypass the
+# default prometheus cookbook Alertmanager configuration template and implement your own
+# templates and recipes to configure Alertmanager.
+default['prometheus']['alertmanager']['config_template_name']                             = 'alertmanager.conf.erb'
+
+# Service key to use when Alertmanager notifies Pager Duty
+default['prometheus']['alertmanager']['pagerduty_service_key']                            = 'supersecretapikey'
+
+# Auth token to use when Alertmanager notifies HipChat
+default['prometheus']['alertmanager']['hipchat_auth_token']                               = 'hipchatauthtoken'
+
+# Room ID to use when Alertmanager notifies HipChat
+default['prometheus']['alertmanager']['hipchat_room_id']                                  = 123456
+

recipes/alertmanager.rb

@@ -0,0 +1,93 @@
+#
+# Cookbook Name:: prometheus
+# Recipe:: alertmanager
+#
+# Author: Paul Magrath <paul@paulmagrath.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include_recipe 'build-essential::default'
+
+user node['prometheus']['user'] do
+  system true
+  shell '/bin/false'
+  home node['prometheus']['dir']
+  not_if { node['prometheus']['use_existing_user'] == true || node['prometheus']['user'] == 'root' }
+end
+
+directory node['prometheus']['dir'] do
+  owner node['prometheus']['user']
+  group node['prometheus']['group']
+  mode '0755'
+  recursive true
+end
+
+directory node['prometheus']['log_dir'] do
+  owner node['prometheus']['user']
+  group node['prometheus']['group']
+  mode '0755'
+  recursive true
+end
+
+# -- Write our Config -- #
+
+template node['prometheus']['alertmanager']['config.file'] do
+  cookbook  node['prometheus']['alertmanager']['config_cookbook_name']
+  source    node['prometheus']['alertmanager']['config_template_name']
+  mode      0644
+  owner     node['prometheus']['user']
+  group     node['prometheus']['group']
+  notifies  :restart, 'service[alertmanager]'
+end
+
+# -- Do the install -- #
+
+# These packages are needed go build
+%w( curl git-core mercurial gzip sed ).each do |pkg|
+  package pkg
+end
+
+git "#{Chef::Config[:file_cache_path]}/alertmanager-#{node['prometheus']['alertmanager']['version']}" do
+  repository node['prometheus']['alertmanager']['git_repository']
+  revision node['prometheus']['alertmanager']['git_revision']
+  action :checkout
+end
+
+bash 'compile_alertmanager_source' do
+  cwd "#{Chef::Config[:file_cache_path]}/alertmanager-#{node['prometheus']['alertmanager']['version']}"
+  code <<-EOH
+    make &&
+    mv alertmanager #{node['prometheus']['dir']}
+  EOH
+
+  notifies :restart, 'service[alertmanager]'
+end
+
+template '/etc/init/alertmanager.conf' do
+  source 'upstart/alertmanager.service.erb'
+  mode 0644
+  notifies :restart, 'service[alertmanager]', :delayed
+end
+
+service 'alertmanager' do
+  provider Chef::Provider::Service::Upstart
+  action [:enable, :start]
+end
+
+# rubocop:disable Style/HashSyntax
+service 'alertmanager' do
+  supports :status => true, :restart => true
+end
+# rubocop:enable Style/HashSyntax
+

templates/default/alertmanager.conf.erb

@@ -0,0 +1,14 @@
+notification_config {
+  name: "alertmanager_pagerduty"
+  pagerduty_config: {
+    service_key: "<%= node['prometheus']['alertmanager']['pagerduty_service_key'] %>"
+  }
+}
+
+notification_config {
+  name: "alertmanager_hipchat"
+  hipchat_config: {
+    auth_token: "<%= node['prometheus']['alertmanager']['hipchat_auth_token'] %>"
+    room_id: <%= node['prometheus']['alertmanager']['hipchat_room_id'] %>
+  }
+}

templates/default/upstart/alertmanager.service.erb

@@ -0,0 +1,14 @@
+description "Prometheus Alertmanager"
+start on (local-filesystems and net-device-up IFACE!=lo)
+stop on runlevel [016]
+
+respawn
+env GOMAXPROCS=<%= node['cpu']['total'] %>
+setuid <%= node['prometheus']['user'] %>
+setgid <%= node['prometheus']['user'] %>
+
+script
+  exec >> "<%= node['prometheus']['log_dir'] %>/alertmanager.log"
+  exec 2>&1
+  exec <%= node['prometheus']['alertmanager']['binary'] %> -config.file=<%= node['prometheus']['alertmanager']['config.file'] %>
+end script