Chef Expander replaces the chef-solr-indexer daemon that was included with Chef 0.8 and 0.9
bunny
yajl
eventmachine
em-http-request
amqp
highline
A Nagios plugin to monitor queue backlog is included in scripts/ directory as check_queue_size To run it with the warning threshold at 250 messages and critical at 500 messages:
check_queue_size -w 250 -c 500
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