Merge Advice is a badge we display on pull requests to indicate how confident we are that merging the pull request will not result in any breaking changes.

We determine this advice based on how that same change has performed on other Snyk users' pull requests – did their tests on the PR pass or fail? Was the change subsequently rolled back? Once we've gathered enough data, we either give the advice "review recommended", or "high chance of success".

If we haven't yet been able to collect enough data to give trustworthy advice, we show the message "not enough data". Once we've gathered enough data, we update this badge automatically with our recommendation – for that reason, a badge that was displaying "not enough data" might later show advice.

At the moment, merge advice badges are visible on GitHub pull requests on Yarn and npm packages where a single package is being upgraded. More support is coming soon.