Chef Expander replaces the chef-solr-indexer daemon that was included with Chef 0.8 and 0.9
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bunny
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yajl
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eventmachine
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em-http-request
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amqp
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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