From 4d58dbbf44ec07022db6abfadc8a992a6496bc1b Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Wed, 17 Nov 2021 08:31:12 +0000
Subject: [PATCH] Add support for monitoring files with filestat_exporter

---
 cookbooks/prometheus/attributes/default.rb    |  1 +
 cookbooks/prometheus/recipes/default.rb       | 23 +++++++++++++++++++
 .../templates/default/filestat.yml.erb        |  6 +++++
 3 files changed, 30 insertions(+)
 create mode 100644 cookbooks/prometheus/templates/default/filestat.yml.erb

diff --git a/cookbooks/prometheus/attributes/default.rb b/cookbooks/prometheus/attributes/default.rb
index dba44a6b1..a239c6a19 100644
--- a/cookbooks/prometheus/attributes/default.rb
+++ b/cookbooks/prometheus/attributes/default.rb
@@ -2,6 +2,7 @@ default[:prometheus][:addresses] = {}
 default[:prometheus][:exporters] = {}
 default[:prometheus][:snmp] = {}
 default[:prometheus][:metrics] = {}
+default[:prometheus][:files] = []
 
 if node[:recipes].include?("prometheus::server")
   default[:apt][:sources] |= ["grafana"]
diff --git a/cookbooks/prometheus/recipes/default.rb b/cookbooks/prometheus/recipes/default.rb
index 6e88362a4..85c5ec312 100644
--- a/cookbooks/prometheus/recipes/default.rb
+++ b/cookbooks/prometheus/recipes/default.rb
@@ -121,3 +121,26 @@ unless node[:prometheus][:snmp].empty?
     register_target false
   end
 end
+
+if node[:prometheus][:files].empty?
+  prometheus_exporter "filestat" do
+    action :delete
+  end
+
+  file "/etc/prometheus/filestat.yml" do
+    action :delete
+  end
+else
+  template "/etc/prometheus/filestat.yml" do
+    source "filestat.yml.erb"
+    owner "root"
+    group "root"
+    mode "644"
+  end
+
+  prometheus_exporter "filestat" do
+    port 9943
+    options "--config.file=/etc/prometheus/filestat.yml"
+    subscribes :restart, "template[/etc/prometheus/filestat.yml]"
+  end
+end
diff --git a/cookbooks/prometheus/templates/default/filestat.yml.erb b/cookbooks/prometheus/templates/default/filestat.yml.erb
new file mode 100644
index 000000000..f77ecab6d
--- /dev/null
+++ b/cookbooks/prometheus/templates/default/filestat.yml.erb
@@ -0,0 +1,6 @@
+exporter:
+  files:
+    - patterns:
+<% node[:prometheus][:files].each do |file| -%>
+        - <%= file %>
+<% end -%>
-- 
2.39.5