From 0f94d4cf2bc15692f0f4f8c188ee50bf2bab64d9 Mon Sep 17 00:00:00 2001
From: Thomas Sibley <tsibley@fredhutch.org>
Date: Thu, 5 Nov 2020 14:27:11 -0800
Subject: [PATCH] wip! enable systemd collector for prometheus' node_exporter

Collects metrics for systemd units.

XXX TODO: Likely needs more configuration in the form of additional
node_exporter CLI options.
---
 backoffice.yaml       |  5 +++++
 tasks/prometheus.yaml | 13 +++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/backoffice.yaml b/backoffice.yaml
index 0ea4a4a..4082776 100644
--- a/backoffice.yaml
+++ b/backoffice.yaml
@@ -33,6 +33,11 @@
         name: prometheus
         state: reloaded
 
+    - name: prometheus-node-exporter is restarted
+      service:
+        name: prometheus-node-exporter
+        state: restarted
+
     - name: promtail is restarted
       service:
         name: promtail
diff --git a/tasks/prometheus.yaml b/tasks/prometheus.yaml
index 8a9589e..232d123 100644
--- a/tasks/prometheus.yaml
+++ b/tasks/prometheus.yaml
@@ -48,6 +48,19 @@
   notify:
     - prometheus is reloaded
 
+- name: prometheus-node-exporter invocation is configured
+  replace:
+    path: /etc/default/prometheus-node-exporter
+    regexp: '(?ms)^ARGS=".+?"$'
+    replace: |-
+      ARGS="--collector.diskstats.ignored-devices=^(ram|loop|fd|(h|s|v|xv)d[a-z]|nvme\\d+n\\d+p)\\d+$ \
+            --collector.filesystem.ignored-mount-points=^/(sys|proc|dev|run)($|/) \
+            --collector.netdev.ignored-devices=^lo$ \
+            --collector.textfile.directory=/var/lib/prometheus/node-exporter \
+            --collector.systemd"
+  notify:
+    - prometheus-node-exporter is restarted
+
 - name: prometheus-textfile group exists
   group:
     name: prometheus-textfile