0.3.0 / 2015-03-03

This is the big one that changes fingerprinting. See below.

As long as you build the Prometheus server only with make, nothing
can go wrong, as the client_golang is vendored then. But if you
build from your own sources (with go build), you will compile in
whatever you have checked out in client_golang.

Version 0.12.0 of the Prometheus server will have a guard to not
accidentally run from a storage with the old fingerprinting.

• [CHANGE] Changed the fingerprinting for metrics. THIS WILL INVALIDATE ALL
  PERSISTED FINGERPRINTS. IF YOU COMPILE THE PROMETHEUS SERVER WITH THIS
  VERSION, YOU HAVE TO WIPE THE PREVIOUSLY CREATED STORAGE.
• [CHANGE] LabelValuesToSignature removed. (Nobody had used it, and it was
  arguably broken.)
• [CHANGE] Vendored dependencies. Those are only used by the Makefile. If
  client_golang is used as a library, the vendoring will stay out of your way.
• [BUGFIX] Remove a weakness in the fingerprinting for metrics. (This made
  the fingerprinting change above necessary.)
• [FEATURE] Added new fingerprinting functions SignatureForLabels and
  SignatureWithoutLabels to be used by the Prometheus server. These functions
  require fewer allocations than the ones currently used by the server.

0.2.0 / 2015-02-23

client_golang 0.2.0 has been released, with the most prominent new feature being server-side histograms. (Documentations will be updated later today to explain usage.)

0.2.0 / 2015-02-23

• [FEATURE] Introduce new Histagram metric type.
• [CHANGE] Ignore process collector errors for now (better error handling
  pending).
• [CHANGE] Use clear error interface for process pidFn.
• [BUGFIX] Fix Go download links for several archs and OSes.
• [ENHANCEMENT] Massively improve Gauge and Counter performance.
• [ENHANCEMENT] Catch illegal label names for summaries in histograms.
• [ENHANCEMENT] Reduce allocations during fingerprinting.
• [ENHANCEMENT] Remove cgo dependency. procfs package will only be included if
  both cgo is available and the build is for an OS with procfs.
• [CLEANUP] Clean up code style issues.
• [CLEANUP] Mark slow test as such and exclude them from travis.
• [CLEANUP] Update protobuf library package name.
• [CLEANUP] Updated vendoring of beorn7/perks.

Early warning: The fingerprinting method has an embarrassing bug (#74), which will be fixed in v0.3.0, but that will obviously invalidate each and every persisted fingerprint. We thought long about a conversion path or allowing to continue with the old fingerprinting method but could not come up with anything feasible. So one more storage wipe is looming...

0.1.0 / 2015-02-02

0.1.0 / 2015-02-02

• [CLEANUP] Introduced semantic versioning and changelog. From now on,
  changes will be reported in this file.