From a8261d1b13150b9ded3e6d4733ac5c381c390cdc Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Sun, 13 Mar 2022 22:51:34 +0000
Subject: [PATCH] Configure prometheus scraping for discourse servers

---
 cookbooks/community/recipes/default.rb                    | 6 ++++++
 cookbooks/prometheus/recipes/server.rb                    | 3 +++
 cookbooks/prometheus/templates/default/prometheus.yml.erb | 7 +++++++
 3 files changed, 16 insertions(+)

diff --git a/cookbooks/community/recipes/default.rb b/cookbooks/community/recipes/default.rb
index 5178f1617..003e69f1e 100644
--- a/cookbooks/community/recipes/default.rb
+++ b/cookbooks/community/recipes/default.rb
@@ -112,3 +112,9 @@ template "/etc/cron.daily/community-backup" do
   group "root"
   mode "750"
 end
+
+node.default[:prometheus][:exporters][443] = {
+  :name => "community",
+  :address => "#{node[:prometheus][:address]}:443",
+  :sni => "community.openstreetmap.org"
+}
diff --git a/cookbooks/prometheus/recipes/server.rb b/cookbooks/prometheus/recipes/server.rb
index 0b6e2a0d2..6214f1858 100644
--- a/cookbooks/prometheus/recipes/server.rb
+++ b/cookbooks/prometheus/recipes/server.rb
@@ -229,16 +229,19 @@ search(:node, "recipes:prometheus\\:\\:default").sort_by(&:name).each do |client
     if exporter.is_a?(Hash)
       name = exporter[:name]
       address = exporter[:address]
+      sni = exporter[:sni]
       metric_relabel = exporter[:metric_relabel] || []
     else
       name = key
       address = exporter
+      sni = nil
       metric_relabel = []
     end
 
     jobs[name] ||= []
     jobs[name] << {
       :address => address,
+      :sni => sni,
       :instance => client.name.split(".").first,
       :metric_relabel => metric_relabel
     }
diff --git a/cookbooks/prometheus/templates/default/prometheus.yml.erb b/cookbooks/prometheus/templates/default/prometheus.yml.erb
index d5a8debaf..9b24a4d45 100644
--- a/cookbooks/prometheus/templates/default/prometheus.yml.erb
+++ b/cookbooks/prometheus/templates/default/prometheus.yml.erb
@@ -57,6 +57,13 @@ scrape_configs:
         replacement: 127.0.0.1:9219
 <% @jobs.sort.each do |name, targets| -%>
   - job_name: <%= name %>
+<% if targets.first[:sni] -%>
+    tls_config:
+      server_name: <%= targets.first[:sni] %>
+    relabel_configs:
+      - target_label: __scheme__
+        replacement: https
+<% end -%>
     static_configs:
 <% targets.each do |target| -%>
       - targets:
-- 
2.39.5