Metrics Message Producer

The Metrics Message Producer receives information from the Metrics Generator at regular intervals and writes the information into metrics messages, which it then sends to one of a number of metric topic destinations, depending on the type of metric information contained in the message (see Table 4–2). Message Queue clients subscribed to these metric topic destinations can consume the messages and process the metric data they contain. This allows developers to create custom monitoring tools to support messaging applications. For details of the metric quantities reported in each type of metrics message, see the Message Queue Developer’s Guide for Java Clients.

The broker properties imq.metrics.topic.enabled and imq.metrics.topic.interval control, respectively, whether messages are sent to metric topic destinations and how often. The imq.metrics.topic.timetolive and imq.metrics.topic.persist properties specify the lifetime of such messages and whether they are persistent.

Besides the information contained in the body of a metrics message, the header of each message includes properties that provide the following additional information:

• The message type

• The address (host name and port number) of the broker that sent the message

• The time the metric sample was taken

These properties are useful to client applications that process metrics messages of different types or from different brokers.