From e4d0812a6952d11949d09d8119c0d075460ffeae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20D=C3=A9siles?=
 <1536672+cdesiles@users.noreply.github.com>
Date: Sun, 6 Sep 2026 23:51:22 +0200
Subject: [PATCH] fix(grafana): NUT dashboard instance variable ignores stale
 series

The variable used label_values() which lists all instances across full
retention, alphabetically sorting and auto-selecting the dead
127.0.0.1:9199 (relabeled to 'eaton' ~31h ago). Its stale series has no
samples in the visible window so every panel rendered empty. Replace with
query_result(count by (instance) (...)) which only surfaces live targets.
---
 roles/grafana/files/nut-status-dashboard.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/roles/grafana/files/nut-status-dashboard.json b/roles/grafana/files/nut-status-dashboard.json
index 2ad200f..71183ed 100644
--- a/roles/grafana/files/nut-status-dashboard.json
+++ b/roles/grafana/files/nut-status-dashboard.json
@@ -16,7 +16,8 @@
         "label": "UPS",
         "type": "query",
         "datasource": { "type": "prometheus", "uid": "prometheus" },
-        "query": { "query": "label_values(network_ups_tools_device_info, instance)", "refId": "A" },
+        "query": { "query": "query_result(count by (instance) (network_ups_tools_device_info))", "refId": "A" },
+        "regex": "/.*instance=\"([^\"]+)\".*/",
         "refresh": 2,
         "multi": false,
         "includeAll": false,