From 9e84a5405cce3adcbbcd0481cb1a130da44d4c0a Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Tue, 23 Feb 2021 10:05:39 +0100
Subject: [PATCH] Add a Prometheus alert on no incoming connection (#7517)

---
 .../monitoring/alerting-rules/alerting-rules.yaml          | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/substrate/.maintain/monitoring/alerting-rules/alerting-rules.yaml b/substrate/.maintain/monitoring/alerting-rules/alerting-rules.yaml
index cf00d7e2b9..5ee2376677 100644
--- a/substrate/.maintain/monitoring/alerting-rules/alerting-rules.yaml
+++ b/substrate/.maintain/monitoring/alerting-rules/alerting-rules.yaml
@@ -108,6 +108,13 @@ groups:
     annotations:
       message: 'The node {{ $labels.instance }} has less than 3 peers for more
       than 15 minutes'
+  - alert: NoIncomingConnection
+    expr: increase(polkadot_sub_libp2p_incoming_connections_total[20m]) == 0
+    labels:
+      severity: warning
+    annotations:
+      message: 'The node {{ $labels.instance }} has not received any new incoming
+      TCP connection in the past 20 minutes. Is it connected to the Internet?'
 
   ##############################################################################
   # System