From be7eca3a8962435cdf478ef889ca2a86947185ce Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Tue, 4 Nov 2025 14:18:56 +0100
Subject: [PATCH] prometheus: allow setting custom retention time

15 days is default and also too short.
---
 roles/prometheus/README.md         | 2 +-
 roles/prometheus/handlers/main.yml | 6 ++++++
 roles/prometheus/tasks/main.yml    | 8 ++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/roles/prometheus/README.md b/roles/prometheus/README.md
index 13309e1..8764570 100644
--- a/roles/prometheus/README.md
+++ b/roles/prometheus/README.md
@@ -1,3 +1,3 @@
 Install and configure prometheus.
 
-Job definitions should be placed in /etc/prometheus/conf.d by roles using this one.
+Job definitions should be placed in /etc/prometheus/conf.d by roles using this one. Data retention time can be set with the `retention` property in a NetBox config context.
diff --git a/roles/prometheus/handlers/main.yml b/roles/prometheus/handlers/main.yml
index c85cc91..f2d38df 100644
--- a/roles/prometheus/handlers/main.yml
+++ b/roles/prometheus/handlers/main.yml
@@ -3,3 +3,9 @@
     name: prometheus
     state: reloaded
   when: "'handler' not in ansible_skip_tags"
+
+- name: restart prometheus
+  service:
+    name: prometheus
+    state: restarted
+  when: "'handler' not in ansible_skip_tags"
diff --git a/roles/prometheus/tasks/main.yml b/roles/prometheus/tasks/main.yml
index 9e44c4d..076f659 100644
--- a/roles/prometheus/tasks/main.yml
+++ b/roles/prometheus/tasks/main.yml
@@ -8,6 +8,14 @@
     path: /etc/prometheus/conf.d
     state: directory
 
+- name: Configure prometheus retention time
+  when: retention is defined
+  lineinfile:
+    path: /etc/conf.d/prometheus
+    regexp: "^prometheus_retention_time="
+    line: "prometheus_retention_time={{ retention }}"
+  notify: restart prometheus
+
 - name: Configure prometheus
   copy:
     dest: /etc/prometheus/