0.3.0

An incremental, if large, release of Go kit. With contributions from @basvanbeek, @bbrazil, @briankassouf, @cam-stitt, @dvrkps, @everesio, @Fenthick, @groob, @jstordeur, @kpacha, @marcusolsson, @mishudark, @peterbourgon, @rossmcf, @suyash, and @xla. Thanks, contributors!

Bug fixes

• Fix synchronization bug in metrics/generic.Histogram (#392)
• Fixes tracking changes to OpenTracing (#387, #374, #339)
• Fixes and improvements to package metrics/influx (#369)
• Correct HTTP tags in distributed tracing spans (#375)
• Fix some dead and breaking code in package sd/consul (#371)
• Fix panic on inconsistent label cardinality (#365)
• Fix To/From mixup in package tracing (#348)

Enhancements

• Completely refactor package metrics (#313) ★
• Add package auth/jwt (#335)
• Add package metrics/pcp for Intel Performance CoPilot (#363)
• Add package log/experimental_level (#357)
• Custom error behavior for lb.Retry (#370)
• Update examples/shipping (#388)
• Go Report Card fixes (#379)
• Remove unused errors from package endpoint (#361)
• Add metrics.Timer (#358)
• Add better unit tests for package sd/etcd.Client (#344)

Documentation

• Clarify comments in package metrics (#342)
• Fix typo in package auth/jwt docs (#385)
• Fix typo in package log docs (#380, #351)
• Fix typo in package metrics/expvar docs #356
• Provide better initial guidance in package circuitbreaker docs (#345)