Rename "failures" to "failed" in qless-stats

Graphite/whisper cannot have a name that serves both
as a metric name and as a dot-delimited prefix to
another metric. Because individual failure types are
reported as "failures.<type>", the "failures" metric
fails to be reported if ever there has been a report
of "failures.<type>". While this tool is not specific
to graphite, it is a common tool in the monitoring
ecosystem and it takes little effort to make this tool
compatible.

Author: Dan Lecocq

README.md

@@ -663,3 +663,12 @@ Mailing List
 
 For questions and general Qless discussion, please join the [Qless
 Mailing list](https://groups.google.com/forum/?fromgroups#!forum/qless).
+
+Release Notes
+=============
+
+0.12.0
+------
+The metric `failures` provided by `qless-stats` has been replaced by `failed` for
+compatibility with users of `graphite`. See [#275](https://github.com/seomoz/qless/pull/275)
+for more details.

exe/qless-stats

@@ -96,7 +96,7 @@ class Stats < Thor
         client.gauge "failures.#{failure}", count
         count
       end.reduce(0, :+)
-      client.gauge 'failures', total
+      client.gauge 'failed', total
 
       # Track workers
       client.gauge 'workers', qless.workers.counts.length

lib/qless/version.rb

@@ -1,5 +1,5 @@
 # Encoding: utf-8
 
 module Qless
-  VERSION = '0.11.0'
+  VERSION = '0.12.0'
 end

spec/integration/exe/qless_stats_spec.rb

@@ -124,7 +124,7 @@ def get_statsd_messages
       end
 
       it 'tracks total failures' do
-        expect(messages).to include('failures:1|g')
+        expect(messages).to include('failed:1|g')
       end
 
       it 'tracks worker counts' do