Device latency threshold values
Entuity measures device latency as the time between an Entuity server sending an ICMP Ping Echo request to the management IP address of a device and receiving a response.
Device latency metrics:
Entuity records device response time to its ICMP ping using the following metrics:
- ICMP Latency.
- response time in milliseconds from Entuity sending an ICMP Ping Echo request to an IP address and receiving a response. This is original sample data from which Entuity derives all other ICMP latency values.
- Average ICMP Latency Hourly.
- mean average response time in milliseconds over the previous hour from Entuity sending an ICMP Ping Echo request to an IP address and receiving a response. Rising and Falling Latency thresholds are set via the device's Thresholds dashboard.
- When the value for the current hourly average:
- exceeds the High Latency threshold by the set number of milliseconds, Entuity raises an AvailMonitor Latency High event.
- exceeds the previous, adjacent hourly average by the set number of milliseconds, Entuity raises an AvailMonitor Latency Rising Average event.
- falls short of the previous, adjacent hourly average
- % ICMP Latency Exceeds Hourly.
- % of responses over the previous hour to the IP address that exceeded the High Latency threshold. Entuity does not raise events on this sample data, only on the hourly average data.
- ICMP Latency Trend.
- derived Exponential Moving Average (EMA) hourly trend value. To calculate the trend value, Entuity combines the previous hour's average value with the EMA value calculated for the same hour a week earlier, assigning a weighting of 20% and 80% respectively.
- For the first week of managing an IP address, ICMP Latency Trend and Average ICMP Latency Hourly values are the same. The data history for the object does not exceed a week, so an EMA is not calculated.
- When the ICMP Latency Trend exceeds the Rising Trend Latency threshold by the set number of milliseconds, Entuity raises an AvailMonitor Rising Trend Latency event.
Device latency threshold values:
To collect average latency information, you must enable the High Latency Threshold for each device. You can set latency thresholds against all devices managed by the Entuity server, or against individual devices. All latency thresholds are disabled by default. Please see this article for help and information on enabling thresholds in Entuity.
Attribute | Description |
---|---|
Falling Latency Threshold | when the average real-time latency value for the hour falls short of the previous hourly value by the set number of milliseconds, Entuity will raise an AvailMonitor Falling Average Latency event. |
High Latency Threshold | when the average real-time latency value for the hour exceeds the amount set, Entuity raises an AvailMonitor High Latency event. The High Latency Threshold option must be enabled for Entuity to collect device average latency information. |
Rising Latency Threshold | when the average real-time latency value for the hour exceeds the previous hourly value by the set number of milliseconds, Entuity will raise an AvailMonitor Rising Average Latency event. |
Rising Trend Latency Threshold | when the average real-time latency value for the hour exceeds the trend for the same hour of the week by the set number of milliseconds, Entuity will raise an AvailMonitor Rising Average in Trend Latency event. |
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