Performance Analytics generates alerts to help administrators to monitor the environment proactively. The alerts are generated when factors affecting the user experience get deteriorated.

Alert policies

The available policies are listed in the Alert Policies tab. The alerts are enabled by default, and can be disabled using the Status toggle. By default, alert mails are sent to all full administrators in the customer. Click the alert name to edit the mail recipients list.

You must enable receiving email notifications from the Account Settings menu in Citrix Cloud to receive the alert mails. For more information, see the Notifications article.

Alert for Machines with Zombie Sessions

A Zombie session alert mail is generated when a new machine with a zombie session is detected in the environment in a 15 mins interval.

An email alert containing details of the number of machines with zombie sessions and sessions failures that have resulted due to zombie sessions is sent to the administrators. The numbers in the mailer are for the last 15 min interval.

Zombie alerts mailer

Click View machines in the mailer to see single-session machines with abandoned sessions in the Self-service view for Machines with Zombie Sessions. The view reflects the 15 min interval as per the mailer, use the time navigator to choose a larger time window.

Realerting on the same machine is done only if the same-abandoned session persists on the same machine for over 24 hours from the initial detection.

Alert for Sessions with Anomalous Latency

Poor in-session responsiveness is the primary cause for poor session experience. The Anomalous Latency Alerts feature alerts administrators when there is a significant deviation in the session latency values. The proactive alerting helps administrators identify specific locations or Delivery Groups from which poor sessions might be originating.

A machine learning model is used to determine the baseline latency value for all Delivery Group-Location pairs in a specific customer. The baseline latency value is calibrated every day based on the data from the last three days. Any outlier measurements of ICARTT are ignored. If the measured ICARTT has a deviation of 60% or more from the baseline latency value, an alert is generated. The amount of deviation quantifies the impact of the poor latency on the session experience for these users.

The next alert is generated when the ICARTT measurements are higher than the last known value.

Anomalous latency alert

This feature requires you to configure your StoreFront servers to enable Citrix Workspace app to send events to Citrix Analytics. Follow the steps as described in Onboard Virtual Apps and Desktops Sites using StoreFront.

The mail contains the following details for a specific customer, Delivery Group, and Location,

  • Latency, the ICARTT value measured in the specified period
  • Delivery Group of the virtual machine
  • Location of the endpoint
  • Median Latency and its variation from the baseline.
  • Number of sessions affected by poor responsiveness
  • Percentage variation of measured latency from the baseline value.

Click View Issue Details to go to the Sessions self-service view with the list of sessions that were affected by poor responsiveness. Analyze the fields showing such as the Location, ICARTT, ISP, Bandwidth, and Latency metrics for a specific session to root cause the issue. For more information about the indicators available in the sessions based self-service view, see Self-service search for sessions.

Alert for Overloaded Machines

Machines that have experienced sustained CPU spikes, or high memory usage, or both, that have lasted for 5 minutes or more, resulting in a poor user experience during the selected interval are considered to be overloaded. An Overloaded Machines alert mail is sent to administrators when an overloaded machine is detected in the environment in a 15 minutes interval.

Overloaded Machines Alert

If the machine continues to be in overloaded condition, realert mails are generated,

  • in the case of a single-session machine, once in 24 hours,
  • in the case of multi-session machines, up to three times on the first day if the machine has a new session with poor Session Score and once after 24 hours.

The alert mail shows the number of overloaded machines causing poor user experience and the number of users affected during the selected duration.

Click View Machines to see the overloaded machines listed in the Machines self-service page for Overloaded Machines.

The Patterns Detected section shows the top three patterns noticed in overloaded machines with respect to the following criteria:

  • Number of overloaded machines in each Delivery Group
  • Number of overloaded machines running single-session or multi-session OS
  • Number of overloaded machines with Sustained Memory or CPU spikes

The View latest insights link leads to the User Experience dashboard showing the latest statistics in the Insights panel.

For more information about Overloaded Machine Insights, see the Insights article.

Alert for Black Hole Machines

Citrix Analytics for Performance scans for black hole machines every 15 minutes and sends out an alert to enable administrators to proactively mitigate session failures faced by users due to black hole machines. Machines that have failed to service four or more consecutive session requests are termed as Black hole machines. With black hole failure alerting, administrators need not be logged into Performance Analytics to know the session failures that occurred due to black hole machines. Details of the machines and the session failures caused by them are sent in the alert mails to administrators. The Black Hole Machines alert policy must be enabled to receive these mails.

Black Hole Machines Alert

Clicking the View machines link takes you to the Machines self-service view displaying the list of black hole machines during the 15 min interval. In addition, the timeline view shows black hole machines identified over the last 24 hours. Administrators are realerted if the number of session failures due to the same black hole machine is doubled within 24 hours.

The View latest insights link leads to the User Experience dashboard showing the latest statistics in the Insights panel.

For more information about Black Hole Machine Insights, see the Insights article.