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diff --git a/packaging/VERSIONING_AND_PUBLIC_API.md b/packaging/VERSIONING_AND_PUBLIC_API.md new file mode 100644 index 00000000..79c53785 --- /dev/null +++ b/packaging/VERSIONING_AND_PUBLIC_API.md @@ -0,0 +1,145 @@ +# Netdata Agent Versioning Policy (DRAFT) + +This document outlines how versions are handled for the Netdata Agent. This policy applies to version 2.0.0 of +the Netdata Agent and newer versions. + +## Stable Releases + +Versions for stable releases of the Netdata Agent consist of three parts, a major version, a minor version, and +a patch version, presented like `<major>.<minor>.<patch>`. For example, a version of `1.42.3` has a major version +of 1, a minor version of 42, and a patch version of 3. + +The patch version is incremented when a new stable release is made that only contains bug fixes that do not alter +the public API in a backwards incompatible manner. Special exceptions may be made for critical security bugs, +but such exceptions will be prominently noted in the release notes for the versions for which they are made. + +The minor version is incremented when a new stable release is made that contains new features and functionality +that do not alter the strictly defined parts of public API in a backwards incompatible manner. A new minor version +may have changes to the loosely defined parts of the public API that are not backwards compatible, but unless +they are critical security fixes they will be announced ahead of time in the release notes for the previous minor +version. Once a new minor version is published, no new patch releases will be published for previous minor versions +unless they fix serious bugs. + +The major version is incremented when a new stable release is made that alters the strictly defined public API in +some backwards incompatible manner. Any backwards incompatible changes that will be included in a new major version +will be announced ahead of time in the release notes for the previous minor version. Once a given major version +is published, no new minor releases will be published for any prior major version, though new patch releases _may_ +be published for the latest minor release of any prior major version to fix serious bugs. + +In most cases, just prior to a new major version being published, a final stable minor release will be published +for the previous major version, including all non-breaking changes that will be in the new major version. This is +intended to ensure that users who choose to remain on the previous major version for an extended period of time +will be as up-to-date as possible. + +## Nightly Builds + +Versions for nightly builds of the Netdata Agent consist of four parts, a major version, a minor version, a revision +number, and an optional commit ID, presented like `<major>.<minor>.0-<revision>-<commit>`. For example, a version +of `1.43.0-11-gb15437502` has a major version of 1, a minor version of 43, a revision of 11, and a commit ID of +`gb15437502`. A commit ID consists of a lowercaase letter `g`, followed by the short commit hash for the corresponding +commit. If the commit ID is not included, it may be replaced by the word ‘nightly’. + +The major and minor version numbers for a nightly build correspond exactly to an associated stable release. A +given major version of a nightly build has the same compatibility guarantees as it would for a stable release. A +given minor version of a nightly build will generally include any backwards-incompatible changes to the loosely +defined public API that will be in the _next_ minor version of the associated stable release. + +The revision number indicates the number of commits on the main branch of the Netdata Agent git repository since +the associated stable release, and the commit ID, if included, should indicate the exact commit hash used for the +nightly build. + +Due to how our release process works, nightly version numbers do not track stable patch releases. For example, if the +latest stable release is `1.42.4`, the latest nightly version will still show something like `1.42.0-209-nightly`. The +first nightly build version published after an associated stable release will include all relevant fixes that were +in that stable release. In addition, in most cases, the last nightly build version published before an associated +stable patch release will include all relevant fixes that are in that patch release. + +Nightly builds are only published on days when changes have actually been committed to the main branch of the +Netdata Agent git repository. + +## Public API + +The remainder of the document outlines the public API of the Netdata agent. + +We define two categories of components within the public API: + +- Strictly defined components are guaranteed not to change in a backwards incompatible manner without an associated + major version bump, and will have impending changes announced in the release notes at least one minor release + before they are changed. +- Loosely defined components are guaranteed not to change in a backwards incompatible manner without an associated + minor version bump, and will have impending changes announced in the release notes at least one minor release + before they are changed. + +There are also a few things we handle specially, which will be noted later in the document. + +### Strictly Defined Public API Components + +The following aspects of the public API are strictly defined, and are guaranteed not to change in a backwards +incompatible manner without an associated major version increase, and such changes will be announced in the release +notes at least one minor release prior to being merged: + +- All mandatory build dependencies which are not vendored in the Netdata Agent code. This includes, but is not + limited to: + - The underlying build system (such as autotools or CMake). + - Primary library dependencies (such as libuv). + - Any external tooling that is required at build time. +- The REST API provided by the Netdata Agent’s internal web server, accessible via the `/api` endpoint. This + does not extend to the charts, labels, or other system-specific data returned by some API endpoints. +- The protocol used for streaming and replicating data between Netdata Agents. +- The protocol used for communicating with external data collection plugins. +- The APIs provided by the `python.d.plugin` and `charts.d.plugin` data collection frameworks. +- The set of optional features supported by the Agent which are provided by default in our pre-built packages. If + support for an optional feature is being completely removed from the agent, that is instead covered by what + component that feature is part of. + +### Loosely Defined Public API Components + +The following aspects of the public API are loosely defined. They are guaranteed to not change in a backwards +incompatible manner without an associated minor version increase, and such changes will be announced in the release +notes at least one minor release prior to being merged: + +- Configuration options in any configuration file normally located under `/etc/netdata` on a typical install, + as well as their default values. +- Environment variables that are interpreted by the Netdata Agent, or by the startup code in our official OCI + container images. +- The exact set of charts provided, including chart families, chart names, and provided metrics. +- The exact set of supported data collection sources and data export targets. +- The exact set of system service managers we officially support running the Netdata Agent under. +- The exact set of alert delivery mechanisms supported by the Netdata Agent. +- The high-level implementation of the Netdata Agent’s integrated web server. +- The v0 and v1 dashboard UIs provided through the Netdata Agent’s internal web server. + +All loosely defined API components may also change in a backwards incompatible manner if the major version is +increased. Large scale changes to these components may also warrant a major version increase even if there are no +backwards incompatible changes to strictly defined public API components. + +### Special Cases + +The following special exceptions to the public API exist: + +- When an internal on-disk file format (such as the dbengine data file format) is changed, the old format is + guaranteed to be supported for in-place updates for at least two minor versions after the change happens. The + new format is not guaranteed to be backwards compatible. +- The list of supported platforms is functionally a part of the public API, but our existing [platform support + policy](https://github.com/netdata/netdata/blob/master/packaging/PLATFORM_SUPPORT.md) dictates when and how + support for specific platforms is added or removed. +- The list of components provided as separate packages in our official native packages is considered part of our + strictly defined public API, but changes to our packaging that do not alter the functionality of existing installs + are considered to be backwards compatible. This means that we may choose to split a plugin out to it’s own + package at any time, but it will remain as a mandatory dependency until at least the next major release. +- Options and environment variables used by the `kickstart.sh` install script and the `netdata-updater.sh` script + are handled separately from regular Netdata Agent versioning. Backwards compatible changes may happen at any + time for these, while backwards incompatible changes will have a deprecation period during which the old behavior + will be preserved but will issue a warning about the impending change. + +### Things Not Covered By The Public API + +Any components which are not explicitly listed above as being part of the public API are not part of the public +API. This includes, but is not limited to: + +- Any mandatory build components which are vendored as part of the Netdata sources, such as SQLite3 or libJudy. This + extends to both the presence or abscence of such components, as well as the exact version being bundled. +- The exact installation mechanism that will be used on any given system when using our `kickstart.sh` installation + script. +- The exact underlying implementation of any data collection plugin. +- The exact underlying implementation of any data export mechanism. |