Threshold Crossing Alerts (TCAs) are pre-emptive, user-configurable alarms triggered when specific thresholds are crossed.
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To create a tunnel-specific alert, go to Configuration > Tunnels, select the tunnel, click the Edit icon to access the tunnel directly, and then click the icon in the Alert Options column. Make your changes and click OK.
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Times to Trigger - A value of 1 triggers an alarm on the first threshold crossing instance.
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Appliance Capacity - triggers when an appliance reaches 95% of its total flow capacity. It is not configurable and can only be cleared by an operator.
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File-system utilization - percent of non-Network Memory disk space filled by the appliance. This TCA cannot be disabled.
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Tunnel latency - measured in milliseconds, the maximum latency of a one-second sample within a 60-second span
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LAN-side receive throughput - based on a one-minute average, the LAN-side receive TOTAL for all interfaces
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WAN-side transmit throughput - based on a one-minute average, the WAN-side transmit TOTAL for all interfaces
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Note 
Enabled by default, there is also an Appliance Capacity TCA that triggers when an appliance reaches 95% of its total flow capacity. It doesn’t automatically clear, but can be cleared by an operator. It is also not configurable.
Enabled by default, there is also an Appliance Capacity TCA that triggers when an appliance reaches 95% of its total flow capacity. It doesn’t automatically clear, but can be cleared by an operator. It is also not configurable.
This table lists the defaults of each type of threshold crossing alert:
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allow rising
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