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> Monitoring and Statistics
> There are a number of aspects of a multicast deployment that can be analyzed to determine the deployment’s health and status and to aid in troubleshooting.
> Monitoring
> The server publishes messages to two monitoring topics specifically related to multicast. These topics are $sys.monitor.multicast.status and $sys.monitor.multicast.stats.
> The server publishes monitoring messages to the topic $sys.monitor.multicast.status. These messages contain information about the status of a multicast consumer and the multicast daemon to which it is connected. This information includes when a consumer has successfully joined a multicast group and when a consumer experiences an error, such as unrecoverable loss in its multicast daemon. By monitoring multicast errors you can detect which consumers are experiencing problems, allowing you to take corrective action.
> Low-level multicast statistics are published in a monitoring message to the topic $sys.monitor.multicast.stats. The statistics include information such as the number of bytes sent to a multicast group and the number of NAKs sent by a multicast daemon. These multicast statistics can aid in troubleshooting a multicast deployment when provided to TIBCO technical support. Generally these statistics won’t have much meaning to a typical user. Multicast statistics are only published when the server’s multicast_statistics_interval is set to a non-zero value. By default the multicast_statistics_interval is set to zero.
> See Chapter 17, Monitoring Server Activity for more information on monitoring.
> Statistics
> The server’s multicast channel statistics can be viewed using the administration API or the administration command line tool. Multicast channel statistics include:

> • | The average number of messages sent per second.

> • | The average number of bytes sent per second.

> • | The total number of messages sent.

> • | The total number of bytes sent.

> • | Detailed statistics for each topic using the channel.

> See Working with Server Statistics for more information on statistics.

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