73.3 What Monitoring Topics are Published?

Two categories of predefined monitoring topics are sent out:

• Descriptions are published when an entity is created or deleted, or there are QoS changes (see Table 73.1 Descriptions (QoS and Other Static System Information)).
• Entity Statistics are published periodically (see Table 73.2 Entity Statistics (Statuses, Aggregated Statuses, CPU and Memory Usage)).

Table 73.1 Descriptions (QoS and Other Static System Information)

Topic Name	Topic Contents
rti/dds/monitoring/domainParticipantDescription	DomainParticipant QoS and other static information
rti/dds/monitoring/topicDescription	Topic QoS and other static information
rti/dds/monitoring/publisherDescription	Publisher QoS and other static information
rti/dds/monitoring/subscriberDescription	Subscriber QoS and other static information
rti/dds/monitoring/dataReaderDescription	DataReader QoS and other static information
rti/dds/monitoring/dataWriterDescription	DataWriter QoS and other static information

 

Table 73.2 Entity Statistics (Statuses, Aggregated Statuses, CPU and Memory Usage)

Topic Name	Topic Contents
rti/dds/monitoring/domainParticipantEntityStatistics	Number of entities discovered in the system, CPU and memory usage of the process
rti/dds/monitoring/dataReaderEntityStatistics	DataReader statuses
rti/dds/monitoring/dataWriterEntityStatistics	DataWriter statuses
rti/dds/monitoring/topicEntityStatistics	Topic statuses
rti/dds/monitoring/ dataReaderEntityMatchedPublicationStatistics	DataReader statuses calculated on a per discovered matching writer basis
rti/dds/monitoring/ dataWriterEntityMatchedSubscriptionStatistics	DataWriter statuses calculated on a per discovered matching reader basis
rti/dds/monitoring/ dataWriterEntityMatchedSubscriptionWithLocatorStatistics	DataWriter statuses calculated on a per sending destination basis

All monitoring data are sent out using specially created DataWriters with the above topics.

You can configure some aspects of Monitoring Library’s behavior, such as which monitoring topics to turn on, which user topics to monitor, how often to publish the statistics topics, and whether to publish monitoring data using (a) the participant created in the user’s application that has monitoring turned on or (b) a separate participant created just for publishing monitoring data. See 73.5 Configuring Monitoring Library.