This module provides a handler called upstream_status that can be used
as follows:

location /foo {
upstream_status;
}


It reports all the upstream blocks configured for this server. For
upstreams managed using the round robin (default upstream), it lists all
the backends configured in a block and indicates the current status
(up/down)

http://github.com/anomalizer/ngx_upstream_status


Improvements are welcome.

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