Supported Device and Health Statistics

You can view real-time device and health statistics in device-specific dashboards and in custom dashboards.

For more information about the services discussed in this topic, see Visibility Manager Microservices.

Device statistics

The Statistics Collection Service (SCS) processes the statistics that are displayed in dashboards. Statistics are obtained from supported devices in the following ways.

Extreme 9920 devices: When a 9920 device is discovered, Visibility Manager uses gNMI to subscribe to the required statistic types. The collected statistics are processed and displayed in dashboards.
SLX devices: When an SLX device is discovered, Visibility Manager is configured as a telemetry collector for streaming statistics. Streamed statistics are processed and displayed in dashboards.
MLX devices: Visibility Manager runs CLI commands periodically to collect statistics, which are processed and displayed in dashboards.

Table 1. Supported statistics by device type
Statistic	9920	SLX	MLX
Ingress group	Yes	No	No
Interface	Yes	Yes	Yes
Egress policy	Yes	No	No
Ingress policy	Yes	Yes	Yes
System	Yes	Yes	Yes
Interface summary	Yes	Yes	Yes

Device health management

The Device Health Monitoring Service (DHMS) runs on the region nodes and controls health management information. It manages device health and informs the other microservices about a device‘s state. Based on this information, the other microservices update their internal states and respond accordingly. The DHMS also manages syslog and event streams from a device.

Syslog: A device generates logs from different components running on the system. These logs are consumed by the syslog client on the device. Visibility Manager enables syslog configuration when a device is discovered. The Device Receive Service (DRS) hosts the syslog server and streams the syslog messages to the DHMS and Visibility Manager, where the messages are displayed.
Events: Events for Extreme 9920 devices are supported by gNMI subscriptions to the paths of interest. The following events are supported: device state, chassis state, port status, and port-channel status. Events are displayed per device in the dashboards.
Note
Because SLX and MLX devices do not support gNMI, this functionality is not supported on those devices.
Device availability: Visibility Manager periodically checks for device availability. When a failure occurs or an offline device comes back online, Visibility Manager generates an event and forwards it to internal services. The change in the device state is reflected in the Notification area of the user interface.