April 25, 2024
Summary: This article contains details about the metrics collected by the node_exporter.
The next table contains details about the metrics collected by the node_exporter.
File system metrics
metric group: node_filesystem
| metric | type | description |
|---|---|---|
| device | LABEL | Device of the filesystem |
| mountpoint | LABEL | Mount point of the filesystem |
| fstype | LABEL | The type of filesystem |
| size_bytes | GAUGE | Filesystem size in bytes |
| avail_bytes | GAUGE | Filesystem space available to non-root users in bytes |
| free_bytes | GAUGE | Filesystem free space in bytes. |
| files | GAUGE | Filesystem total file nodes |
| files_free | GAUGE | Filesystem total free file nodes |
| device_error | GAUGE | Whether an error occurred while getting statistics for the given device |
| readonly | GAUGE | Filesystem read-only status. |
Disk metrics
metric group: node_disk
| metric | type | description |
|---|---|---|
| flush_requests_time_seconds_total | COUNTER | This is the total number of seconds spent by all flush requests. |
| flush_requests_total | COUNTER | The total number of flush requests completed successfully. |
| io_time_seconds_total | COUNTER | Total seconds spent doing I/Os. |
| read_bytes_total | COUNTER | The total number of bytes read successfully. |
| read_time_seconds_total | COUNTER | The total number of seconds spent by all reads. |
| reads_completed_total | COUNTER | The total number of reads completed successfully. |
| reads_merged_total | COUNTER | The total number of reads merged. |
| write_time_seconds_total | COUNTER | This is the total number of seconds spent by all writes. |
| writes_completed_total | COUNTER | The total number of writes completed successfully. |
| writes_merged_total | COUNTER | The number of writes merged. |
| written_bytes_total | COUNTER | The total number of bytes written successfully. |
Memory metrics
metric group: node_memory
| metric | type | description |
|---|---|---|
| Active_bytes | GAUGE | The amount of memory that has been used more recently and is usually not reclaimed unless absolutely necessary. |
| Bounce_bytes | GAUGE | The amount of memory used for the block device “bounce buffers”. |
| Buffers_bytes | GAUGE | The amount of temporary storage for raw disk blocks. |
| Cached_bytes | GAUGE | The amount of physical RAM used as cache memory. |
| CommitLimit_bytes | GAUGE | The total amount of memory currently available to be allocated on the system based on the overcommit ratio (vm.overcommit_ratio). This limit is only adhered to if strict overcommit accounting is enabled (mode 2 in vm.overcommit_memory). |
| Committed_AS_bytes | GAUGE | The total amount of memory, estimated to complete the workload. This value represents the worst case scenario value, and also includes swap memory. |
| Dirty_bytes | GAUGE | The total amount of memory, waiting to be written back to the disk. |
| HugePages_Free | GAUGE | The total number of hugepages available for the system. |
| HugePages_Rsvd | GAUGE | The number of unused huge pages reserved for hugetlbfs. |
| HugePages_Surp | GAUGE | The number of surplus huge pages. |
| HugePages_Total | GAUGE | The total number of hugepages for the system. The number is derived by dividing Hugepagesize by the megabytes set aside for hugepages specified in /proc/sys/vm/hugetlb_pool. |
| Hugepagesize_bytes | GAUGE | The size for each hugepages unit. By default, the value is 4096 KB on uniprocessor kernels for 32 bit architectures. For SMP, hugemem kernels, and AMD64, the default is 2048 KB. For Itanium architectures, the default is 262144 KB. |
| Hugetlb_bytes | GAUGE | This is the total amount of memory, consumed by huge pages of all sizes. If huge pages of different sizes are in use, this number will exceed HugePages_Total * Hugepagesize. |
| Inactive_bytes | GAUGE | The amount of memory that has been used less recently and is more eligible to be reclaimed for other purposes. |
| Mapped_bytes | GAUGE | The memory used for files that have been mmaped, such as libraries. |
| MemAvailable_bytes | GAUGE | An estimate of how much memory is available for starting new applications, without swapping. |
| MemFree_bytes | GAUGE | The amount of physical RAM left unused by the system. |
| MemTotal_bytes | GAUGE | Total amount of usable RAM, which is physical RAM minus a number of reserved bits and the kernel binary code. |
| PageTables_bytes | GAUGE | The total amount of memory dedicated to the lowest page table level. |
| Shmem_bytes | GAUGE | The total amount of memory, used by shared memory (shmem) and tmpfs. |
| SwapCached_bytes | GAUGE | The amount of memory that has once been moved into swap, then back into the main memory, but still also remains in the swapfile. This saves I/O, because the memory does not need to be moved into swap again. |
| SwapFree_bytes | GAUGE | The total amount of swap free. |
| SwapTotal_bytes | GAUGE | The total amount of swap available. |
| WritebackTmp_bytes | GAUGE | The amount of memory used by FUSE for temporary writeback buffers. |
| Writeback_bytes | GAUGE | The total amount of memory actively being written back to the disk. |
Network metrics
metric group: node_network
| metric | type | description |
|---|---|---|
| mtu_bytes | GAUGE | The maximum transmission unit. IP datagrams larger than MTU bytes will be fragmented into multiple Ethernet frames. |
| receive_bytes_total | COUNTER | The total number of bytes of data received by the interface. |
| receive_compressed_total | COUNTER | The number of compressed packets received by the device driver. |
| receive_drop_total | COUNTER | The total number of packets dropped by the device driver. |
| receive_errs_total | COUNTER | The total number of receive errors detected by the device driver. |
| receive_fifo_total | COUNTER | The number of FIFO buffer errors. |
| receive_frame_total | COUNTER | The number of packet framing errors. |
| receive_multicast_total | COUNTER | The number of multicast frames received by the device driver. |
| receive_packets_total | COUNTER | The total number of packets of data received by the interface. |
| speed_bytes | GAUGE | The speed of the network device. |
| transmit_bytes_total | COUNTER | The total number of bytes of data transmitted by the interface. |
| transmit_carrier_total | COUNTER | The number of carrier losses detected by the device driver. |
| transmit_colls_total | COUNTER | The number of collisions detected on the interface. |
| transmit_compressed_total | COUNTER | The number of compressed packets transmitted by the device driver. |
| transmit_drop_total | COUNTER | The total number of packets dropped by the device driver. |
| transmit_errs_total | COUNTER | The total number of transmit errors detected by the device driver. |
| transmit_fifo_total | COUNTER | The number of FIFO buffer errors. |
| transmit_packets_total | COUNTER | The total number of packets of data transmitted by the interface. |
| transmit_queue_length | GAUGE | The length of the transmit queue of the device. |
See more
Metrics in PostgreSQL monitoring with Prometheus