From 404906dac761c07df1c22c479c3cf1f2fcf44da6 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sun, 26 Sep 2021 22:38:09 +0200
Subject: prometheus: add some openwrt specific alert rules

---
 .../server/defaults/main/rules_openwrt.yml           | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'roles/monitoring/prometheus/server/defaults')

diff --git a/roles/monitoring/prometheus/server/defaults/main/rules_openwrt.yml b/roles/monitoring/prometheus/server/defaults/main/rules_openwrt.yml
index 04b178f1..d4bc934d 100644
--- a/roles/monitoring/prometheus/server/defaults/main/rules_openwrt.yml
+++ b/roles/monitoring/prometheus/server/defaults/main/rules_openwrt.yml
@@ -1,4 +1,20 @@
 ---
 prometheus_server_rules_openwrt_extra: []
-prometheus_server_rules_openwrt: []
-## TODO: add openwrt specific alert rules
+prometheus_server_rules_openwrt:
+  - alert: HostConntrackTableFillingUp
+    expr: node_nf_conntrack_entries / node_nf_conntrack_entries_limit * 100 > 70
+    for: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: Host conntrack table is filling up (instance {{ '{{' }} $labels.instance {{ '}}' }})
+      description: "Node conntrack table usage is > 70%.\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"
+
+  - alert: HostConntrackTableAlmostFull
+    expr: node_nf_conntrack_entries / node_nf_conntrack_entries_limit * 100 > 90
+    for: 2m
+    labels:
+      severity: critical
+    annotations:
+      summary: Host conntrack table is almost full (instance {{ '{{' }} $labels.instance {{ '}}' }})
+      description: "Node conntrack table usage is > 90%.\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"
-- 
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