The meaning of node_exporter performance monitoring information collection in Prometheus

System Uptime: 系统（服务器）运行时间

Total RAM：总内存
CPU Cores: Cpu核数
CPU IOWait：Cpu IO阻塞程度, 一般iowait在20%will affect the business

CPU Busy: in useCPU占比

Used Max Mount(/)：The percentage of used disks
Used RAM Memory: The percentage of memory in use
Used SWAP： The percentage of virtual memory in use

Disk Space Used Basic（EXT4/XFS）：The percentage of disk space for all mounted filesystems

EXT4: 第四代扩展文件系统,是Linux系统下的日志文件系统
XFS:一种高性能的日志文件系统

Open File Descriptor(left)/Context switches(right):It is estimated that it is the case of opening files and thread switching

Open File Descriptor:文件描述符
Context switches:上下文(进程)切换

System Load: linux系统负载平均值

注意两个关键词：一个是“负载”,它衡量的是task（linux 内核中用于描述一个进程或者线程）对系统的需求（CPU、内存、IO等等）,第二个关键词是“平均”,它计算的是一段时间内的平均值,分别为 1、5 和 15 分钟值.system load average由内核负载计算并记录在/proc/loadavg 文件中, 用户态的工具（比如uptime,top等等）读的都是这个文件.

如果load接近0,意味着系统处于空闲状态
如果 1min 平均值高于 5min 或 15min 平均值,则负载正在增加
如果 1min 平均值低于 5min 或 15min 平均值,则负载正在减少
如果它们高于系统 CPU 的数量,那么系统很可能遇到了性能问题（视情况而定）

CPU Basic：cpu的基本信息

Busy System: cpuOccupation in the core state
Busy User: cpuThe proportion of processing user mode
Busy Iowait: cpu处理于ioThe percentage of time spent waiting
Busy IRQs: cpuThe proportion of processing interrupt status
Idle: cpuPercentage in idle state

Network Traffic Basic: Basic network information for each interface

Receive: 各个（所有）Download traffic for the network interface
Transmit: 各个（所有）Upload traffic for the network interface

Disk Space User Basic：The percentage of disk space for all mounted filesystems

Memory Basic：内存的基本信息

RAM Total：内存大小
RAM Used: 已使用的内存大小(内存总量-空闲的内存大小-Buffer缓存和CachedThe size of the memory occupied by the cache)
RAM Free/Avaliable: 空闲的内存大小
RAM Cache + Buffer: CachedThe size of the memory occupied by the cache
SWAP Used: Size of swap memory used

Time Spent Doing I/Os:输入/输出操作花费的毫秒数

Sda_IO time: sda磁盘输入/The time spent in the output operation
Dm-0 time: lvmInput to the logical partition/The time spent in the output operation
– dm是device mapper（设备映射）的意思

Disk IOps Completed: The speed at which the disk completes reads and writes

Reads completed: 每个磁盘分区每秒读完成次数
Writes completed: 每个磁盘分区每秒写完成次数

Disk R/W data: Disk reads and writes data every second

Written Bytes：每个磁盘分区每秒写入的比特数
Read bytes: 每个磁盘分区每秒读取的比特数

Disk R/W Time(Reference：less than 100ms)(beta)

Rwite time:The number of milliseconds each disk partition write operation took
Read time:The number of milliseconds spent reading each disk partition

Network Sockstat: The number of sockets released by the network connection

Sockets_used:已使用的所有协议套接字总量
TCP_alloc: 已分配（已建立、已申请到sk_buff）的TCP套接字数量
TCP_tw: 等待关闭的TCP连接数
TCP_inuse: 正在使用（正在侦听）的TCP套接字数量
TCP_orphan: 无主（不属于任何进程）的TCP连接数（无用、待销毁的TCP socket数）
UDP_inuse: 正在使用的 UDP 套接字数量
UDP_mem: UDP 套接字缓冲区使用量
UDP_alloc: 已分配的UDP套接字数量

Hardware Temperature: 服务器温度

Because personal services do not have this monitoring data,So the picture is temporarily omitted

介绍完毕,Hope you all like it,谢谢