To display different types of metrics on the user interface, vRealize Network Insight Cloud collects data from multiple sources. Each piece of data collected is called a metric observation or a metric value.

vRealize Network Insight Cloud displays the following metrics on the user interface:

Metric Description Retention Period
Entity metrics

Entity metrics display information such as resource utilization and performance of entities in your network. They include metrics such as host metrics, VM metrics, datastore metrics, and so on.

See Entity Metrics to learn more.

As per the retention period configured in the system.

Flow metrics

Flow metrics display the traffic flow data collected from flow-enabled data sources on your network.

The flow data from the data sources is:
  • Derived and aggregated to show different flow metrics such as total bytes, traffic rate, and so on.
  • Aggregated on the tier level to show application tier metrics such as average drop flows, total internet packet, and so on.

See Flow Metrics to learn more.

The retention period of metrics with 5-minute resolution is 24 hours.

The retention period of metrics with other resolutions is 31 days.

Health metrics

Health metrics represent the overall health of the vRealize Network Insight Cloud instance. These metrics are useful in diagnosing health problems related to the vRealize Network Insight Cloud instance.

As per the retention period configured in the system.

VM network utilization metrics

The VM network utilization metrics display the performance of the VM based on network utilization. These metrics are critical to track network activity and throughput.

In vRealize Network Insight Cloud, these metrics are displayed at 20 second resolution to showcase the peaks and troughs of network utilization.

Note:

VM network utilization metrics are displayed at 20 seconds granularity only if you are viewing the metric chart within the last 48 hours. Beyond 48 hours, the metric resolution is displayed based on the selected time range.

See VM Network Utilization Metrics to learn more.

The retention period of metrics with 20 seconds resolution is 2 days.

The retention period of metrics with other resolutions is as per the retention configured in the system.

Comprehending Metric Data

You can view your metric data at different levels of granularity, based on the time range. For example, you can choose a one day view, which can be useful when troubleshooting. Or, choose a broader time range (for example, 30 days) so that you can see trends over time.

When you view metric data for different time ranges, you see different values indicated in the metric chart. This difference is because vRealize Network Insight Cloud displays different resolutions of data for different time ranges.

The default time range of any metric in vRealize Network Insight Cloud is 1 day and the resolution is 5 minutes. As the metric resolution becomes coarser, the metric data is down-sampled. That is, the resolution of the data is reduced. This is performed to create better metric graph visualizations by retaining only the important characteristics of the metric.

Time range and metric resolution for entity metrics:

Time Range Metric Resolution
0 hours – 3.5 days 5 minutes
3.5 days – 15 days 30 minutes
15 days – 60 days 2 hours
Beyond 60 days 8 hours

Time range and metric resolution for flow metrics:

Time Range Metric Resolution
0 hours - 24 hours (within last 24 hours) 5 minutes
0 hours - 24 hours (beyond last 24 hours) 30 minutes
1 day – 15 days 30 minutes
15 days – 31 days 2 hours

Time range and metric resolution for special VM network utilization metrics:

Time Range Metric Resolution
0 hours – 6 hours (within last 48 hours) 20 seconds
0 hours – 6 hours (beyond last 48 hours) 5 minutes
6 hours – 3.5 days 5 minutes
3.5 days – 15 days 30 minutes
15 days – 60 days 2 hours
Beyond 60 days 8 hours