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<?xml version="1.0"?>
<!DOCTYPE entities [
<!ENTITY % entities SYSTEM "commonEntities.xml">
%entities;
]>
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<appendix id="Java-Broker-Appendix-Queue-Alerts">
<title>Queue Alerts</title>
<para>The Broker supports a variety of queue alerting thresholds. Once configured on a queue,
these limits will be periodically written to the log if these limits are breached, until the
condition is rectified.</para>
<para>For example, if queue <literal>myqueue</literal> is configured with a message count alert of
1000, and then owing to a failure of a downstream system messages begin to accumulate on the
queue, the following alerts will be written periodically to the log. </para>
<screen>
INFO [default:VirtualHostHouseKeepingTask] (queue.NotificationCheck) - MESSAGE_COUNT_ALERT
On Queue myqueue - 1272: Maximum count on queue threshold (1000) breached.
</screen>
<para>Note that queue alerts are <emphasis>soft</emphasis> in nature; breaching the limit will
merely cause the alerts to be generated but messages will still be accepted to the queue.</para>
<table pgwide="1" id="Java-Broker-Appendix-Queue-Alerts-Alerting-Messages">
<title>Queue Alerts</title>
<tgroup cols="2">
<thead>
<row>
<entry>Alert Name</entry>
<entry>Alert Format and Purpose</entry>
</row>
</thead>
<tbody>
<row>
<entry morerows="1">MESSAGE_COUNT_ALERT</entry>
<entry> MESSAGE_COUNT_ALERT On Queue <replaceable>queuename</replaceable> -
<replaceable>number of messages</replaceable>: Maximum count on queue threshold
(<replaceable>limit</replaceable>) breached. </entry>
</row>
<row>
<entry>
<para>The number of messages on the given queue has breached its configured
limit.</para>
</entry>
</row>
<row>
<entry morerows="1">MESSAGE_SIZE_ALERT</entry>
<entry> MESSAGE_SIZE_ALERT On Queue <replaceable>queuename</replaceable>
-<replaceable>message size</replaceable> : Maximum message size threshold
(<replaceable>limit</replaceable>) breached. [Message ID=<replaceable>message
id</replaceable>]</entry>
</row>
<row>
<entry>
<para>The size of an individual messages has breached its configured limit.</para>
</entry>
</row>
<row>
<entry morerows="1">QUEUE_DEPTH_ALERT</entry>
<entry> QUEUE_DEPTH_ALERT On Queue <replaceable>queuename</replaceable> -
<replaceable>total size of all messages on queue</replaceable> : Maximum queue depth
threshold (<replaceable>limit</replaceable>) breached.</entry>
</row>
<row>
<entry>
<para>The total size of all messages on the queue has breached its configured
limit.</para>
</entry>
</row>
<row>
<entry morerows="1">MESSAGE_AGE_ALERT</entry>
<entry>MESSAGE_AGE_ALERT On Queue <replaceable>queuename</replaceable> - <replaceable>age
of message</replaceable> : Maximum age on queue threshold
(<replaceable>limit</replaceable>) breached. </entry>
</row>
<row>
<entry>
<para>The age of a message on the given queue has breached its configured limit.</para>
</entry>
</row>
</tbody>
</tgroup>
</table>
</appendix>
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