copr-be: enable systemd metrics in node exporter

roles/copr/backend/tasks/main.yml

@@ -162,6 +162,13 @@
 - name: start node exporter
   service: state=started enabled=yes name=node_exporter
 
+- name: configure options in node exporter
+  lineinfile:
+    path: /etc/sysconfig/node_exporter
+    regexp: '^OPTIONS='
+    line: 'OPTIONS=--collector.textfile.directory /var/lib/node_exporter/textfile_collector --collector.systemd'
+  notify: restart node_exporter
+
 # setup dirs for the ansible execution off of provisioning
 #- name: dirs from provision
 #  file: state=directory path="/home/copr/provision/{{ item }}" owner=copr group=copr