groups:

- name: MysqldExporter

  
  rules:

    # 1m delay allows a restart without triggering an alert.
    - alert: MysqlDown
      expr: 'mysql_up == 0'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: MySQL down (instance {{ $labels.instance }})
        description: "MySQL instance is down on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlTooManyConnections(>80%)
      expr: 'max_over_time(mysql_global_status_threads_connected[1m]) / mysql_global_variables_max_connections * 100 > 80 and mysql_global_variables_max_connections > 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        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: MysqlHighPreparedStatementsUtilization(>80%)
      expr: 'max_over_time(mysql_global_status_prepared_stmt_count[1m]) / mysql_global_variables_max_prepared_stmt_count * 100 > 80 and mysql_global_variables_max_prepared_stmt_count > 0'
      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 and mysql_global_variables_max_connections > 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: MySQL high threads running (instance {{ $labels.instance }})
        description: "More than 60% of MySQL connections are in running state on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    # 1m delay allows a restart without triggering an alert.
    - alert: MysqlSlaveIoThreadNotRunning
      expr: '( mysql_slave_status_slave_io_running and ON (instance) mysql_slave_status_master_server_id > 0 ) == 0'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: MySQL Slave IO thread not running (instance {{ $labels.instance }})
        description: "MySQL Slave IO thread not running on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    # 1m delay allows a restart without triggering an alert.
    - alert: MysqlSlaveSqlThreadNotRunning
      expr: '( mysql_slave_status_slave_sql_running and ON (instance) mysql_slave_status_master_server_id > 0) == 0'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: MySQL Slave SQL thread not running (instance {{ $labels.instance }})
        description: "MySQL Slave SQL thread not running on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlSlaveReplicationLag
      expr: '( (mysql_slave_status_seconds_behind_master - mysql_slave_status_sql_delay) and ON (instance) mysql_slave_status_master_server_id > 0 ) > 30'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: MySQL Slave replication lag (instance {{ $labels.instance }})
        description: "MySQL replication lag on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    # mysqld_exporter exposes SHOW GLOBAL STATUS variables as untyped/gauge, so delta() is used instead of increase().
    - alert: MysqlSlowQueries
      expr: 'delta(mysql_global_status_slow_queries[1m]) > 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: MySQL slow queries (instance {{ $labels.instance }})
        description: "MySQL server has some new slow queries ({{ $value }} in the last minute).\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    # mysqld_exporter exposes SHOW GLOBAL STATUS variables as untyped/gauge, so deriv() is used instead of rate().
    - alert: MysqlInnodbLogWaits
      expr: 'deriv(mysql_global_status_innodb_log_waits[15m]) > 10'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: MySQL InnoDB log waits (instance {{ $labels.instance }})
        description: "MySQL innodb log writes stalling ({{ $value }} waits/s)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlRestarted
      expr: 'mysql_global_status_uptime < 60'
      for: 0m
      labels:
        severity: info
      annotations:
        summary: MySQL restarted (instance {{ $labels.instance }})
        description: "MySQL has just been restarted, less than one minute ago on {{ $labels.instance }}.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    # mysqld_exporter exposes SHOW GLOBAL STATUS variables as untyped/gauge, so deriv() is used instead of irate().
    - alert: MysqlHighQps
      expr: 'deriv(mysql_global_status_questions[1m]) > 10000'
      for: 2m
      labels:
        severity: info
      annotations:
        summary: MySQL High QPS (instance {{ $labels.instance }})
        description: "MySQL is being overload with unusual QPS (> 10k QPS).\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlTooManyOpenFiles
      expr: 'mysql_global_status_innodb_num_open_files / mysql_global_variables_open_files_limit * 100 > 75 and mysql_global_variables_open_files_limit > 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: MySQL too many open files (instance {{ $labels.instance }})
        description: "MySQL has too many open files, consider increase variables open_files_limit on {{ $labels.instance }}.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlInnodbForceRecoveryIsEnabled
      expr: 'mysql_global_variables_innodb_force_recovery != 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: MySQL InnoDB Force Recovery is enabled (instance {{ $labels.instance }})
        description: "MySQL InnoDB force recovery is enabled on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: MysqlInnodbHistory_lenTooLong
      expr: 'mysql_info_schema_innodb_metrics_transaction_trx_rseg_history_len > 50000'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: MySQL InnoDB history_len too long (instance {{ $labels.instance }})
        description: "MySQL history_len (undo log) too long on {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"