1.主要总结以下内容：
-CPU
-Load
-内存
-磁盘
-IO
-网络相关
2.CPU相关采集项
cpu.idle：Percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request. CPU空闲百分比
cpu.busy：与cpu.idle相对，他的值等于100减去cpu.idle。
cpu.guest：Percentage of time spent by the CPU or CPUs to run a virtual processor.
cpu.iowait：Percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.
CPU的IO等待的百分比
cpu.irq：Percentage of time spent by the CPU or CPUs to service hardware interrupts.
cpu.softirq：Percentage of time spent by the CPU or CPUs to service software interrupts.
cpu.nice：Percentage of CPU utilization that occurred while executing at the user level with nice priority.
cpu.steal：Percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was servicing another virtual processor.
cpu.system：Percentage of CPU utilization that occurred while executing at the system level (kernel).
cpu.user：Percentage of CPU utilization that occurred while executing at the user level (application).
cpu.cnt：cpu核数。
cpu.switches：cpu上下文切换次数，计数器类型。
3.磁盘相关采集项
df.bytes.free：磁盘可用量，int64
df.bytes.free.percent：磁盘可用量占总量的百分比，float64，比如32.1
df.bytes.total：磁盘总大小，int64
df.bytes.used：磁盘已用大小，int64
df.bytes.used.percent：磁盘已用大小占总量的百分比，float64
df.inodes.total：inode总数，int64
df.inodes.free：可用inode数目，int64
df.inodes.free.percent：可用inode占比，float64
df.inodes.used：已用的inode数据，int64
df.inodes.used.percent：已用inode占比，float64
4.IO相关采集项
disk.io.ios_in_progress：Number of actual I/O requests currently in flight.
disk.io.msec_read：Total number of ms spent by all reads.
disk.io.msec_total：Amount of time during which ios_in_progress >= 1.
disk.io.msec_weighted_total：Measure of recent I/O completion time and backlog.
disk.io.msec_write：Total number of ms spent by all writes.
disk.io.read_merged：Adjacent read requests merged in a single req.
disk.io.read_requests：Total number of reads completed successfully.
disk.io.read_sectors：Total number of sectors read successfully.
disk.io.write_merged：Adjacent write requests merged in a single req.
disk.io.write_requests：total number of writes completed successfully.
disk.io.write_sectors：total number of sectors written successfully.
disk.io.read_bytes： 磁盘的读取速率 ，单位是byte的数字
disk.io.write_bytes： 磁盘的写入速率 ，单位是byte的数字
disk.io.avgrq_sz：下面几个值就是iostat -x 1看到的值
disk.io.avgqu-sz
disk.io.await ：
每一个IO请求的处理的平均时间（单位是毫秒），这里可以理解为IO的响应时间，一般地系统IO响应时间应该低于5ms，如果大于10ms就比较大了。disk.io.svctm
disk.io.util： IO使用率 ，是个百分数，比如56.43，表示56.43%
5.机器负载相关采集项
load.1min： 1分钟运行进程队列中平均负载
load.5min： 5分钟运行进程队列中平均负载
load.15min： 15分钟运行进程队列中平均负载
6.内存相关采集项
mem.memtotal：内存总大小
mem.memused：使用了多少内存
mem.memused.percent：使用的内存占比
mem.memfree.percent： 内存剩余的百分比
mem.swaptotal：swap总大小
mem.swapused：使用了多少swap
mem.swapused.percent：使用的swap的占比
mem.swapfree
mem.swapfree.percent
7.网络相关采集项
net.if.in.bytes： 网络上传速率（M/s）
net.if.in.compressed
net.if.in.dropped
net.if.in.errors
net.if.in.fifo.errs
net.if.in.frame.errs
net.if.in.multicast
net.if.in.packets： 网络上传速率（数据包/s）
net.if.out.bytes： 网络下载速率（M/s）
net.if.out.carrier.errs
net.if.out.collisions
net.if.out.compressed
net.if.out.dropped
net.if.out.errors
net.if.out.fifo.errs
net.if.out.packets： 网络下载速率（数据包/s）
net.if.total.bytes： 网络总传输速率（M/s）
net.if.total.dropped
net.if.total.errors
net.if.total.packets： 网络总传输速率（数据包/s）
