After your pull request is accepted and merged, Matomo uses webhooks to keep track of commits in the main branch.
All commit messages for a plugin are sent to the team on a regular interval. This way the team knows a new version of a plugin needs to be released. However, if a merged commit should not result in a new release (for example because it only fixes tests), then you need to include
[ignore_release] keyword in your commit message. This way the plugins team won't be notified about this commit.
Example commit message: