telegraf/plugins/system/MEM_README.md

1.4 KiB

Telegraf Plugin: MEM

Description

The mem plugin collects memory metrics, defined as follows. For a more complete explanation of the difference between used and actual_used RAM, see Linux ate my ram.

  • total: total physical memory available
  • available: the actual amount of available memory that can be given instantly to processes that request more memory in bytes; In linux kernel 3.14+, this is available natively in /proc/meminfo. In other platforms, this is calculated by summing different memory values depending on the platform (e.g. free + buffers + cached on Linux). It is supposed to be used to monitor actual memory usage in a cross platform fashion.
  • available_percent: Percent of memory available, available / total * 100
  • used: memory used, calculated differently depending on the platform and designed for informational purposes only.
  • free: memory not being used at all (zeroed) that is readily available; note that this doesn't reflect the actual memory available (use 'available' instead).
  • used_percent: the percentage usage calculated as (total - used) / total * 100

Measurements:

Raw Memory measurements:

Meta:

  • units: bytes
  • tags: nil

Measurement names:

  • mem_total
  • mem_available
  • mem_used
  • mem_free

Derived usage percentages:

Meta:

  • units: percent (out of 100)
  • tags: nil

Measurement names:

  • mem_used_percent
  • mem_available_percent