From 2494ccdf3164f06df9e90a1c444511088b52ef47 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rastislav=20P=C3=B4bi=C5=A1?= <rastislav.pobis@gmail.com>
Date: Tue, 26 Mar 2024 16:56:15 +0100
Subject: [PATCH] Added prepared statements mysqld-exporter alert (#407)

---
 _data/rules.yml                      | 5 +++++
 dist/rules/mysql/mysqld-exporter.yml | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/_data/rules.yml b/_data/rules.yml
index 9f430eb12..3dc5c1506 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -588,6 +588,11 @@ groups:
                 query: "max_over_time(mysql_global_status_threads_connected[1m]) / mysql_global_variables_max_connections * 100 > 80"
                 severity: warning
                 for: 2m
+              - name: MySQL high prepared statements utilization (> 80%)
+                description: "High utilization of prepared statements (>80%) on {{ $labels.instance }}"
+                query: "max_over_time(mysql_global_status_prepared_stmt_count[1m]) / mysql_global_variables_max_prepared_stmt_count * 100 > 80"
+                severity: warning
+                for: 2m
               - name: MySQL high threads running
                 description: "More than 60% of MySQL connections are in running state on {{ $labels.instance }}"
                 query: "max_over_time(mysql_global_status_threads_running[1m]) / mysql_global_variables_max_connections * 100 > 60"
diff --git a/dist/rules/mysql/mysqld-exporter.yml b/dist/rules/mysql/mysqld-exporter.yml
index ad8ed5f52..4811ee95a 100644
--- a/dist/rules/mysql/mysqld-exporter.yml
+++ b/dist/rules/mysql/mysqld-exporter.yml
@@ -22,6 +22,15 @@ groups:
         summary: MySQL too many connections (> 80%) (instance {{ $labels.instance }})
         description: "More than 80% of MySQL connections are in use on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
 
+    - alert: MySQL high prepared statements utilization (> 80%)
+      expr: 'max_over_time(mysql_global_status_prepared_stmt_count[1m]) / mysql_global_variables_max_prepared_stmt_count * 100 > 80'
+      for: 2m
+      labels:
+        severity: warning
+      annotations:
+        summary: MySQL high prepared statements utilization (> 80%) (instance {{ $labels.instance }})
+        description: "High utilization of prepared statements (>80%) on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
+
     - alert: MysqlHighThreadsRunning
       expr: 'max_over_time(mysql_global_status_threads_running[1m]) / mysql_global_variables_max_connections * 100 > 60'
       for: 2m