Sentry is a popular error monitoring platform that helps developers identify and resolve critical issues in their JavaScript projects more efficiently. To reduce noise in Sentry's issue stream, users can implement several strategies, including uploading source maps to group errors into individual issues, passing the release version to the Sentry SDK, and ignoring un-actionable errors such as those thrown by browser extensions or React. Additionally, users can enable project inbound filters to prevent issues from appearing in their issues stream, filter out errors known to be caused by browser extensions, and use the third-party error filter integration to automatically filter out errors unrelated to the code that was written. By implementing these strategies, developers can create a more efficient error monitoring experience and focus on resolving critical issues faster.