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104 lines
4.1 KiB
Markdown
104 lines
4.1 KiB
Markdown
# Merge Confidence
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Look at the Merge Confidence badges before merging to:
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- Prevent updates which break in production
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- See at a glance if you should update
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Merge Confidence finds and flags undeclared breaking releases.
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It analyzes test and release adoption data from the Mend Renovate App users.
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## Pull request badges
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Merge Confidence adds the following badges to your pull requests:
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- **Age**: The age of the package
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- **Adoption**: The percentage of this package's users (within Renovate) which are using this release
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- **Passing**: The percentage of updates which have passing tests for this package
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- **Confidence**: The confidence level for this update
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## Supported platforms
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Merge Confidence badges for pull requests are available on any supported platform or Renovate distribution, including Mend Remediate.
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## Supported languages
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Renovate will show Merge Confidence badges for these languages:
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| Language | Datasource |
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| ---------- | ----------- |
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| Golang | `go` |
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| JavaScript | `npm` |
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| Java | `maven` |
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| Python | `pypi` |
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| .NET | `nuget` |
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| PHP | `packagist` |
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| Ruby | `rubygems` |
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We plan to support more languages soon.
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## Enabling and disabling
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If you use the Mend Renovate App then the badges are enabled automatically.
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If you're self-hosting Renovate, you can enable the badges by adding the `mergeConfidence:all-badges` preset to the `extends` array in your Renovate config:
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```json
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{
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"extends": ["mergeConfidence:all-badges"]
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}
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```
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<!-- prettier-ignore -->
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!!! note
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The `mergeConfidence:age-confidence-badges` preset can be used to only show the Age and Confidence badges.
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If you want to disable the badges in the Mend Renovate App, add the `mergeConfidence:all-badges` preset to the `ignorePresets` array in your config:
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```json
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{
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"ignorePresets": ["mergeConfidence:all-badges"]
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}
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```
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## Confidence levels and their meaning
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Merge Confidence uses the following confidence levels:
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- **Low**: We think the update contains breaking changes. Often this is expected because it's a `major` version update, but updates can have unknown breaking changes
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- **Neutral**: We don't have enough data about the update, or we can't decide if the update should be Low or High confidence
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- **High**: We rank updates as High confidence when the combination of `Age`, `Adoption` and `Passing` tests means there's a very low chance of breaking changes
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- **Very High**: We only use this for updates which are months old and have either high `Adoption` or have very high test `Passing` scores
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## How it works
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The Mend Renovate App created millions of pull requests on `github.com` to help developers update their dependencies since 2017.
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We bundle and analyze metrics such as package `Age`, package `Adoption`, and `Passing` tests.
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This way we can find packages that have undeclared breaking changes.
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### Algorithm
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The algorithm that decides on the values is private and is not something we plan to share.
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Similar to a search engine's algorithm, we plan to adjust and improve it over time, for example by using historical data to set a baseline confidence level for packages.
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### Data
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We plan to expose much more of the data via a companion website, such as number of users of a package and popular repositories which already updated to the version in question.
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## Explanations
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### Package ranking
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npm packages less than three days old can be [unpublished](https://docs.npmjs.com/policies/unpublish), which can result in a service impact if you have updated to a package that gets unpublished.
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This is why npm packages can only get the **High** Confidence badge when they are at least three days old.
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### Percentage values weighting
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The percentages for `Adoption` and `Passing` are weighted towards Organizations, private repositories, and projects with high test reliability.
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This means those values aren't _raw_ percentages.
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## Questions and feedback
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You are invited to [start a discussion](https://github.com/renovatebot/renovate/discussions/new/choose) if you have anything you'd like to discuss.
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