From fc136a60a09c7b44ff2c628f9a0bc8d0aa834f84 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Tue, 29 Aug 2023 20:51:02 +0200
Subject: grafana: delete automatically installed dashboards that are no longer
 needed

---
 roles/monitoring/grafana/tasks/main.yml | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'roles')

diff --git a/roles/monitoring/grafana/tasks/main.yml b/roles/monitoring/grafana/tasks/main.yml
index 30f1348e..48a0ec96 100644
--- a/roles/monitoring/grafana/tasks/main.yml
+++ b/roles/monitoring/grafana/tasks/main.yml
@@ -81,7 +81,7 @@
   no_log: yes
   notify: restart grafana
 
-- name: install datasources
+- name: configure dashboard provisioning
   copy:
     dest: "/etc/grafana/provisioning/dashboards/ansible.yml"
     content: |
@@ -110,6 +110,7 @@
   copy:
     content: "{{ lookup('file', 'dashboard-'+item.file+'.json') | regex_replace('\"(?:\\${)?DS_[A-Z0-9_-]+(?:})?\"', '\"'+item.datasource+'\"') }}\n"
     dest: "/var/lib/grafana/dashboards/ansible/{{ item.datasource }}_{{ item.file }}.json"
+  register: grafana_dasboards_from_file
 
 - name: install dashboards from content
   loop: "{{ grafana_dashboards | selectattr('content', 'defined') }}"
@@ -118,6 +119,7 @@
   copy:
     content: "{{ item.content | regex_replace('\"(?:\\${)?DS_[A-Z0-9_-]+(?:})?\"', '\"'+item.datasource+'\"') }}\n"
     dest: "/var/lib/grafana/dashboards/ansible/{{ item.datasource }}_{{ item.name }}.json"
+  register: grafana_dasboards_from_content
 
   ## TODO: implement this
 - name: install dashboards from grafana.com
@@ -126,6 +128,19 @@
     label: "https://grafana.com/api/dashboards/{{ item.id }} -> {{ item.datasource }}"
   debug:
     msg: 'installing dashboards from grafana.com is not yet supported!'
+  # register: grafana_dasboards_from_grafanacom
+
+- name: fetch list of installed dashboards
+  find:
+    paths: /var/lib/grafana/dashboards/ansible
+    patterns: "*.json"
+  register: grafana_dashboards_installed
+
+- name: remove superfluous dashboards
+  loop: "{{ grafana_dashboards_installed.files | map(attribute='path') | difference(grafana_dasboards_from_file.results | map(attribute='dest')) | difference(grafana_dasboards_from_content.results | map(attribute='dest')) | list }}"
+  file:
+    path: "{{ item }}"
+    state: absent
 
 - name: make sure grafana-server is enabled and started
   systemd:
-- 
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