github.com/qingsirliu/mysql_exporter
监控： 1.可用性 2.延迟 请求消耗时间 操作使用时间 3.错误次数 4.容量 当前请求多少/总请求多少 当前连接数量/总的连接数量
mysql => exporter => 监控对象api => 获取指标信息（计算） sql查询 => show global status
mysql可用性 操作失败： select 1; ping 慢查询次数： show global status where variable_name = 'low_queries' 容量： qps: show global status where variable_name = 'Queries' tps: insert, delete, update com_insert com_update com_delete com_select com_replace 连接: show global status where variable_name = 'Threads_running' show global variables where variable_name = 'max_connections' 流量： show global status where variable_name = 'Bytes_received' show global status where variable_name = 'Bytes_send'
// mysql 连接信息 => mysql host, port, user
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