Update versioning plan with Go Modules in mind
Signed-off-by: beorn7 <bjoern@rabenste.in>
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README.md
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README.md
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@ -13,51 +13,39 @@ __This library requires Go1.9 or later.__
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## Important note about releases, versioning, tagging, and stability
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While our goal is to follow [Semantic Versioning](https://semver.org/), this
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repository is still pre-1.0.0. To quote the
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[Semantic Versioning spec](https://semver.org/#spec-item-4): “Anything may
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change at any time. The public API should not be considered stable.” We know
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that this is at odds with the widespread use of this library. However, just
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declaring something 1.0.0 doesn't make it 1.0.0. Instead, we are working
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towards a 1.0.0 release that actually deserves its major version number.
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In this repository, we used to mostly ignore the many coming and going
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dependency management tools for Go and instead wait for a tool that most of the
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community would converge on. Our bet is that this tool has arrived now in the
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form of [Go
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Modules](https://github.com/golang/go/wiki/Modules#how-to-upgrade-and-downgrade-dependencies).
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Having said that, we aim for always keeping the tip of master in a workable
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state. We occasionally tag versions and track their changes in CHANGELOG.md,
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but this happens mostly to keep dependency management tools happy and to give
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people a handle they can talk about easily. In particular, all commits in the
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master branch have passed the same testing and reviewing. There is no QA
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process in place that would render tagged commits more stable or better tested
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than others.
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To make full use of what Go Modules are offering, the previous versioning
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roadmap for this repository had to be changed. In particular, Go Modules
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finally provide a way for incompatible versions of the same package to coexist
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in the same binary. For that, however, the versions must be tagged with
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different major versions of 1 or greater (following [Semantic
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Versioning](https://semver.org/)). Thus, we decided to abandon the original
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plan of introducing a lot of breaking changes _before_ releasing v1 of this
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repository, mostly driven by the widespread use this repository already has and
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the relatively stable state it is in.
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There is a plan behind the current (pre-1.0.0) versioning, though:
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To leverage the mechanism Go Modules offers for a transition between major
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version, the current plan is the following:
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- v0.9 is the “production release”, currently tracked in the master
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branch. “Patch” releases will usually be just bug fixes, indeed, but
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important new features that do not require invasive code changes might also
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be included in those. We do not plan any breaking changes from one v0.9.x
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release to any later v0.9.y release, but nothing is guaranteed. Since the
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master branch will eventually be switched over to track the upcoming v0.10
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(see below), we recommend to tell your dependency management tool of choice
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to use the latest v0.9.x release, at least for your production software. In
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that way, you should get bug fixes and non-invasive, low-risk new features
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without the need to change anything on your part.
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- v0.10 is a planned release that will have a _lot_ of breaking changes
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(despite being only a “minor” release in the Semantic Versioning terminology,
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but as said, pre-1.0.0 means nothing is guaranteed). Essentially, we have
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been piling up feature requests that require breaking changes for a while,
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and they are all collected in the
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[v0.10 milestone](https://github.com/prometheus/client_golang/milestone/2).
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Since there will be so many breaking changes, the development for v0.10 is
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currently not happening in the master branch, but in the
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[dev-0.10 branch](https://github.com/prometheus/client_golang/tree/dev-0.10).
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It will violently change for a while, and it will definitely be in a
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non-working state now and then. It should only be used for sneak-peaks and
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discussions of the new features and designs.
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- Once v0.10 is ready for real-life use, it will be merged into the master
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branch (which is the reason why you should lock your dependency management
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tool to v0.9.x and only migrate to v0.10 when both you and v0.10 are ready
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for it). In the ideal case, v0.10 will be the basis for the future v1.0
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release, but we cannot provide an ETA at this time.
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- The v0.9.x series of releases will see a small number of bugfix releases to
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deal with a few remaining minor issues (#543, #542, #539).
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- After that, all features currently marked as _deprecated_ will be removed,
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and the result will be released as v1.0.0.
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- The planned breaking changes previously gathered as part of the v0.10
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milestone will now go into the v2 milestone. The v2 development happens in a
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[separate branch](https://github.com/prometheus/client_golang/tree/dev-v2)
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for the time being. v2 releases off that branch will happen once sufficient
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stability is reached. v1 and v2 will coexist for a while to enable a
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convenient transition.
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- The API client in prometheus/client_golang/api/… is still considered
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experimental. While it will be tagged alongside the rest of the code
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according to the plan above, we cannot strictly guarantee semver semantics
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for it.
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## Instrumenting applications
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