From cae8812aa96ed547db6fe7e7eabf87c7baab3629 Mon Sep 17 00:00:00 2001
From: Florian Sesser <florian@private.storage>
Date: Tue, 16 Aug 2022 09:57:16 +0000
Subject: [PATCH] Disregard ZFS ARC cache when monitoring free RAM
Since ZoL frees ARC under memory pressure, let's not
count it as "used" but instead as "free" memory.
---
.../server/grafana-dashboards/resources-overview.json | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
index 077c43a3..6eeeb226 100644
--- a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
+++ b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
@@ -370,7 +370,12 @@
"pluginVersion": "8.3.5",
"targets": [
{
- "expr": "1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes",
+ "datasource": {
+ "type": "prometheus",
+ "uid": "000000001"
+ },
+ "exemplar": true,
+ "expr": "1 - (node_memory_MemAvailable_bytes + node_zfs_arc_size) / node_memory_MemTotal_bytes",
"interval": "",
"intervalFactor": 4,
"legendFormat": "{{instance}}",
@@ -1813,7 +1818,7 @@
"type": "timeseries"
}
],
- "refresh": false,
+ "refresh": "",
"schemaVersion": 35,
"style": "dark",
"tags": [],
--
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