Knowledge Base

(Plesk for Linux) Cgroups Manager – Monitoring and Notifications for Resource Consumption

Setting up Monitoring and Notifications

Once you set the limit for a resource, you can also configure Plesk to
monitor the consumption of that resource.
To turn monitoring on, set the following values:

Threshold (“Notify when exceeded.” in Plesk Panel).
Period.

To turn monitoring off, remove the corresponding threshold value.

Allowed Setting Values for Monitoring

The monitoring settings may have the following values:

Setting	Measured in	Available values
CPU limit	Percentage of CPU time, where 100% is one CPU core fully used	Not more than the CPU limit value
RAM limit	Bytes	Not less than 1MB and not more than the RAM limit value
Disk input (write) speed	Bytes per seconds	Not less than 1MB per second and not more than the disk write limit value
Disk output (read) speed	Bytes per seconds	Not less than 1MB per second and not more than the disk read limit value
Check Period (for any resource)	Seconds	300 (5 minutes), 3600 (1 hour), or 86400 (24 hours)

How the System Performs Monitoring

When you enable resource monitoring for one or more resources, the
Cgroups Manager starts monitoring their consumption. If you enabled
resource monitoring on the subscription level, resource usage for that
subscription will be monitored. If you enabled resource monitoring on
the service plan level, resource usage for all subscriptions based on
that service plan will be monitored instead:

Every five minutes the Cgroups Manager counts the average resource
consumption of a subscription and checks whether it is equal or
greater than the threshold.
After every period the Cgroups Manager checks how many times the
subscription has exceeded the threshold within the last
period of time.
- If the subscription has exceeded the threshold in all
  intervals of a period, Cgroups Manager sends an email
  notification.
- If this happens for longer than one …