Host View

The host view displays information about host resource usage and health status, as well as common metrics of system devices such as disks and file systems, so you can better monitor a node.

Metric Description

You can view the host metrics in the following table.

Figure 1 Host metrics
Click to enlarge

**Table 1** Host metrics
Metric	Unit	Description
CPU Usage	%	Usage of each CPU core.
Load Average	N/A	CPU contention. If the value is less than 1, some CPU resources are used for processing requests. If the value is 1, all CPU resources are used for processing requests. If the value is greater than 1, some threads are waiting for processing.
Used Memory	byte	Memory usage in each mode.
Memory Usage	%	Host memory usage.
Disk Written	byte/s	Write rate of each disk.
Disk Read	byte/s	Read rate of each disk.
Used Disk Space	byte	Used and available disk space.
Disk Space Usage	%	Disk usage of each device.
Disk I/O Latency	second	Disk I/O read/write latency, in seconds.
TCP Connection	N/A	The number of TCP sockets. alloc: the number of TCP sockets allocated (established, and sk_buff obtained). inuse: the number of TCP sockets in use (listening) orphan: the number of TCP sockets not associated with applications. tw: the number of TCP sockets waiting to be closed.
UDP Usage	N/A	UDP usage. liteInuse: the number of UDP-Lite sockets in use. inuse: the number of UDP sockets in use. useMemory: the usage of the UPD buffer.
File Descriptor	exabyte	Maximum number of file descriptors.
Used File Descriptor	N/A	The number of allocated file descriptors.
Socket Usage	N/A	Socket usage. socketsUsed: the total number of used protocol sockets. fragInuse: the number of fragment sockets in use. fragMemroy: the usage of the fragment buffer. rawInuse: the number of raw sockets in use.
Abnormal File System	N/A	File system status. readonly: The file system is read-only. deviceError: A file system error occurred.
Disk I/O Rate	N/A	The number of read/write operations on a disk per second.
Disk Read/Write Latency	second	Disk read/write latency.
I/O Queues	N/A	Average I/O queue length of the disk device, which is the weighted number of seconds spent doing I/O operations. A larger value indicates better disk performance of the node.
Process State	N/A	The number of processes in each state.
Connection Tracking Table Entries	N/A	Allocated: the number of allocated entries in the connection tracking table. Total: the maximum number of entries in the connection tracking table.

Metric List

The following is the metric list of the host view.

**Table 2** Metric description
Metric	Type	Description
node_cpu_seconds_total	Counter	Seconds the CPUs spent in each mode.
node_load1	Gauge	Average CPU load within 1 minute, which reflects the competition of CPU resources. If the value is less than 1, some CPU resources are processing requests. If the value is 1, all CPU resources are processing requests. If the value is greater than 1, some threads are waiting for processing.
node_load15	Gauge	Average CPU load within 15 minutes.
node_memory_MemTotal_bytes	Gauge	Total memory of a node.
node_memory_MemAvailable_bytes	Gauge	Available memory of a node.
node_disk_written_bytes_total	Gauge	Total number of bytes written successfully.
node_disk_read_bytes_total	Gauge	Total number of bytes read successfully.
node_filesystem_size_bytes	Gauge	File system size in bytes.
node_filesystem_avail_bytes	Gauge	Available file system size in bytes.
node_disk_io_time_seconds_total	Counter	Total seconds spent doing I/O operations.
node_sockstat_TCP_alloc	Gauge	The number of allocated TCP sockets.
node_sockstat_UDPLITE_inuse	Gauge	The number of used UDPLITE sockets.
node_filefd_maximum	Gauge	File descriptor statistics: maximum.
node_filefd_allocated	Gauge	File descriptor statistics: allocated.
node_sockstat_sockets_used	Gauge	The number of used IPv4 sockets.
node_filesystem_readonly	Gauge	Read-only status of the file system.
node_disk_reads_completed_total	Counter	The number of disk reads completed.
node_disk_read_time_seconds_total	Counter	Total number of seconds spent by all reads.
node_disk_io_time_weighted_seconds_total	Counter	The weighted number of seconds spent doing I/O operations. A larger value indicates better disk performance of the node.
node_procs_blocked	Gauge	The number of processes blocked waiting for I/O to complete.
node_nf_conntrack_entries	Gauge	The number of currently allocated flow entries for connection tracking.