> 1) What statistical data does your subsystem capture (including the
> underlying libraries it integrates).
> 2) What configuration options do you support for enabling/disabling
> statistics gathering. What's the resource address and attribute name of
> the config option?

For the messaging subsystem, we can capture message counters for queues[1].

Capturing the counters is controlled by the /subsystem=messaging/hornetq-server=* resources

* message-counter-enabled attribute (default to false) controls whether the hornetq-server resource capture the counters
* message-counter-sample-period attributecontrols the interval to capture the counters (default to 10s, only relevant if message-counter-enabled is true)
* message-counter-max-day-history attributes controls how many days to keep the message counter history (default to 10 days, only relevant if message-counter-enabled is true)
=> if message-counter-enabled is true, message-counter-sample-period is short, and message-counter-max-day-history is big, the counters can eat up a significant chunk of memory.

The hornetq-server resource has 2 operations to reset the counters and their histories:

* reset-all-message-counter-histories
* reset-all-message-counters

The counters themselves can be fetched from the queue and jms-queue resources (children of the /subsystem=messaging/hornetq-server=* resource) with the operations:

* list-message-counter-as-json
* list-message-counter-as-html
* list-message-counter-history-as-json
* list-message-counter-history-as-html

> 3) Is the statistic gathering enabled by default?

By default, nothing is enabled, nothing is gathered and there should be no performance or memory impact.

[1] http://docs.jboss.org/hornetq/2.4.0.beta1/docs/user-manual/html_single/index.html#management.message-counters

--
Jeff Mesnil
JBoss, a division of Red Hat
http://jmesnil.net/

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