From 7dea0e4f4eac55811a5f8b83845efbbf2eff0df5 Mon Sep 17 00:00:00 2001
From: Kazuhiro MUSASHI <simoom634@yahoo.co.jp>
Date: Sun, 27 Sep 2020 14:03:13 +0900
Subject: [PATCH] Collect `filestat_exporter` metrics.

---
 cookbooks/prometheus/alertmanager_setup.rb           |  2 +-
 .../files/etc/prometheus.d/alerts/filestat.yml       | 12 ++++++++++++
 .../prometheus/files/etc/prometheus.d/prometheus.yml |  9 +++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 cookbooks/prometheus/files/etc/prometheus.d/alerts/filestat.yml

diff --git a/cookbooks/prometheus/alertmanager_setup.rb b/cookbooks/prometheus/alertmanager_setup.rb
index 2620ea7..6968d62 100644
--- a/cookbooks/prometheus/alertmanager_setup.rb
+++ b/cookbooks/prometheus/alertmanager_setup.rb
@@ -17,7 +17,7 @@ remote_file '/etc/prometheus.d/alertmanager.yml' do
 end
 
 # Deploy alert setting file:
-%w(node_exporter prometheus).each do |conf|
+%w(node_exporter prometheus filestat).each do |conf|
   remote_file "/etc/prometheus.d/alerts/#{conf}.yml" do
     owner  'root'
     group  'root'
diff --git a/cookbooks/prometheus/files/etc/prometheus.d/alerts/filestat.yml b/cookbooks/prometheus/files/etc/prometheus.d/alerts/filestat.yml
new file mode 100644
index 0000000..5579b21
--- /dev/null
+++ b/cookbooks/prometheus/files/etc/prometheus.d/alerts/filestat.yml
@@ -0,0 +1,12 @@
+groups:
+- name: filestat
+  rules:
+  - alert: RebootRequired
+    expr: file_glob_match_number{pattern="/var/run/reboot-required"} > 0
+    for: 24h
+    labels:
+      severity: warning
+    annotations:
+      summary: "Instance {{ $labels.instance }} requires rebooting."
+      description: "{{ $labels.instance }} requires rebooting."
+
diff --git a/cookbooks/prometheus/files/etc/prometheus.d/prometheus.yml b/cookbooks/prometheus/files/etc/prometheus.d/prometheus.yml
index df63eec..7a85099 100644
--- a/cookbooks/prometheus/files/etc/prometheus.d/prometheus.yml
+++ b/cookbooks/prometheus/files/etc/prometheus.d/prometheus.yml
@@ -14,6 +14,7 @@ rule_files:
   # - "first.rules"
   # - "second.rules"
   - '/etc/prometheus.d/alerts/node_exporter.yml'
+  - '/etc/prometheus.d/alerts/filestat.yml'
   - '/etc/prometheus.d/alerts/prometheus.yml'
 
 # A scrape configuration containing exactly one endpoint to scrape:
@@ -51,6 +52,14 @@ scrape_configs:
       services:
         - 'node_exporter'
 
+  - job_name: 'filestat'
+    metrics_path: /filestat_exporter/metrics
+
+    consul_sd_configs:
+    - server: 'localhost:8500'
+      services:
+        - 'filestat_exporter'
+
   - job_name: 'grafana'
     consul_sd_configs:
     - server: 'localhost:8500'