From b71ac1f7665947274b96382fa8f2c9f0a3af67d2 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Wed, 17 Nov 2021 19:22:27 +0000
Subject: [PATCH] Switch to using upstream builds for prometheus and
 alertmanager

---
 cookbooks/prometheus/recipes/server.rb        | 69 +++++++++++++++----
 .../default/default.alertmanager.erb          |  3 -
 .../templates/default/default.prometheus.erb  |  3 -
 3 files changed, 57 insertions(+), 18 deletions(-)
 delete mode 100644 cookbooks/prometheus/templates/default/default.alertmanager.erb
 delete mode 100644 cookbooks/prometheus/templates/default/default.prometheus.erb

diff --git a/cookbooks/prometheus/recipes/server.rb b/cookbooks/prometheus/recipes/server.rb
index f9aab32b3..9c215778e 100644
--- a/cookbooks/prometheus/recipes/server.rb
+++ b/cookbooks/prometheus/recipes/server.rb
@@ -32,6 +32,53 @@ prometheus_exporter "fastly" do
   environment "FASTLY_API_TOKEN" => tokens["fastly"]
 end
 
+cache_dir = Chef::Config[:file_cache_path]
+
+prometheus_version = "2.31.1"
+alertmanager_version = "0.23.0"
+
+directory "/opt/prometheus-server" do
+  owner "root"
+  group "root"
+  mode "755"
+end
+
+remote_file "#{cache_dir}/prometheus.linux-amd64.tar.gz" do
+  source "https://github.com/prometheus/prometheus/releases/download/v#{prometheus_version}/prometheus-#{prometheus_version}.linux-amd64.tar.gz"
+  owner "root"
+  group "root"
+  mode "644"
+  backup false
+end
+
+archive_file "#{cache_dir}/prometheus.linux-amd64.tar.gz" do
+  action :nothing
+  destination "/opt/prometheus-server/prometheus"
+  overwrite true
+  strip_components 1
+  owner "root"
+  group "root"
+  subscribes :extract, "remote_file[#{cache_dir}/prometheus.linux-amd64.tar.gz]"
+end
+
+remote_file "#{cache_dir}/alertmanager.linux-amd64.tar.gz" do
+  source "https://github.com/prometheus/alertmanager/releases/download/v#{alertmanager_version}/alertmanager-#{alertmanager_version}.linux-amd64.tar.gz"
+  owner "root"
+  group "root"
+  mode "644"
+  backup false
+end
+
+archive_file "#{cache_dir}/alertmanager.linux-amd64.tar.gz" do
+  action :nothing
+  destination "/opt/prometheus-server/alertmanager"
+  overwrite true
+  strip_components 1
+  owner "root"
+  group "root"
+  subscribes :extract, "remote_file[#{cache_dir}/alertmanager.linux-amd64.tar.gz]"
+end
+
 package %w[
   prometheus
   prometheus-alertmanager
@@ -209,11 +256,11 @@ prometheus_exporter "ssl" do
   register_target false
 end
 
-template "/etc/default/prometheus" do
-  source "default.prometheus.erb"
-  owner "root"
-  group "root"
-  mode "644"
+systemd_service "prometheus-executable" do
+  service "prometheus"
+  dropin "executable"
+  exec_start "/opt/prometheus-server/prometheus/prometheus --config.file=/etc/prometheus/prometheus.yml --web.external-url=https://prometheus.openstreetmap.org/prometheus --storage.tsdb.path=/var/lib/prometheus/metrics2"
+  notifies :restart, "service[prometheus]"
 end
 
 template "/etc/prometheus/prometheus.yml" do
@@ -233,16 +280,15 @@ end
 
 service "prometheus" do
   action [:enable, :start]
-  subscribes :restart, "template[/etc/default/prometheus]"
   subscribes :reload, "template[/etc/prometheus/prometheus.yml]"
   subscribes :reload, "template[/etc/prometheus/alert_rules.yml]"
 end
 
-template "/etc/default/prometheus-alertmanager" do
-  source "default.alertmanager.erb"
-  owner "root"
-  group "root"
-  mode "644"
+systemd_service "prometheus-alertmanager-executable" do
+  service "prometheus-alertmanager"
+  dropin "executable"
+  exec_start "/opt/prometheus-server/alertmanager/alertmanager --config.file=/etc/prometheus/alertmanager.yml --storage.path=/var/lib/prometheus/alertmanager --web.external-url=https://prometheus.openstreetmap.org/alertmanager"
+  notifies :restart, "service[prometheus-alertmanager]"
 end
 
 template "/etc/prometheus/alertmanager.yml" do
@@ -254,7 +300,6 @@ end
 
 service "prometheus-alertmanager" do
   action [:enable, :start]
-  subscribes :restart, "template[/etc/default/prometheus-alertmanager]"
   subscribes :reload, "template[/etc/prometheus/alertmanager.yml]"
 end
 
diff --git a/cookbooks/prometheus/templates/default/default.alertmanager.erb b/cookbooks/prometheus/templates/default/default.alertmanager.erb
deleted file mode 100644
index 42d6e3a3d..000000000
--- a/cookbooks/prometheus/templates/default/default.alertmanager.erb
+++ /dev/null
@@ -1,3 +0,0 @@
-# DO NOT EDIT - This file is being maintained by Chef
-
-ARGS="--web.external-url=https://prometheus.openstreetmap.org/alertmanager"
diff --git a/cookbooks/prometheus/templates/default/default.prometheus.erb b/cookbooks/prometheus/templates/default/default.prometheus.erb
deleted file mode 100644
index 451faa78c..000000000
--- a/cookbooks/prometheus/templates/default/default.prometheus.erb
+++ /dev/null
@@ -1,3 +0,0 @@
-# DO NOT EDIT - This file is being maintained by Chef
-
-ARGS="--web.external-url=https://prometheus.openstreetmap.org/prometheus"
-- 
2.45.1