Collectors

This page contains information about all Collectors included with MOM including the data collected and configuration information. The most up to date information on Collector fields will always be in the source code itself but this page will be kept as up to date as possible.

HostMemory

This collector gathers general memory statistics about the host.
Setup: To use this Collector, simply enable it in the mom configuration file

For example:

[host]
collectors: HostMemory

Data: This Collector provides the following data

mem_available	The total amount of available memory (kB)
mem_unused	The amount of memory that is not being used for any purpose (kB)
mem_free	The amount of free memory including some caches (kB)
swap_in	The amount of memory swapped in since the last collection (pages)
swap_out	The amount of memory swapped out since the last collection (pages)
anon_pages	The amount of memory used for anonymous memory areas (kB)

HostKSM

This collector exposes host KSM statistics as reported in sysfs.

Setup: Enable in the mom config file. If your host does not support KSM this Collector will raise a Fatal Error.

[host]
collectors: HostMemory, HostKSM

Data: This Collector provides the following data
| ksm_run | Status of the KSM daemon: 0 – Stopped, 1 – Running |
| ksm_sleep_millisecs | The amount of idle time between scans (ms) |
| ksm_pages_shared | The number of pages being shared |
| ksm_pages_sharing | The number of sites where a shared page is in use |
| ksm_pages_unshared | The number of pages that are scanned but not shared |
| ksm_pages_to_scan | The number of pages to scan in each work interval |
| ksm_pages_volatile | The number of pages that are changing too fast to be shared |
| ksm_full_scans | The number of times all mergeable memory areas have been scanned |
| ksm_shareable | Estimated amount of host memory that is eligible for sharing |

GuestLibvirt

A collector that uses libvirt to gather information about running guests.

Setup:
Data: This Collector provides the following data

GuestQemuProc

This collector provides statistics related to the guest’s host QEMU process.

Setup:
Data: This Collector provides the following data

GuestNetworkDaemon

This collector communicates over the network with a program running on the guest to gather guest memory statistics.

Setup:
Data: This Collector provides the following data