How to configure offline instance alerts¶
When instances are added to the Enterprise Dashboard either by manually adding the server, or through the Instance Manager by manually adding instances, you will receive alerts in the form of emails if an instance becomes unavailable.
In order to receive these email alerts you must have the email settings for the instance correctly configured.
In order to detect if a server becomes unavailable, the Enterprise Dashboard uses a heartbeat mechanism. This means that by default it will attempt to contact the monitored FusionReactor instance, after three failed attempts we assume that the instance is no longer available.
It is possible to configure both the heartbeat settings and alert settings in the Enterprise Dashboard Settings page.
Under Server Shutdown/Startup Alerts you can disable these alerts entirely, or specify whether to receive emails on shutdown only.
Under Heartbeat Settings you can configure the heartbeat interval, timeout and failure threshold.
While in most cases these settings should provide optimal alerts, it may be that at times your application server stalls and can stop serving requests for a limited time. For example, if a large Garbage Collection is occurring. When this happens it is possible to receive false alarms that your application is unavailable.
Increase the heartbeat interval or failure threshold to prevent these false alarms.
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