# Bug subscription #### IMPORTANT This document has been migrated from help.launchpad.net as is, and has not yet been revised. The content might be outdated, links and images could be broken. We are aware and will fix any issues as soon as possible. This document is a reference for Launchpad’s bug subscription feature. This feature helps you to keep track of bugs via email and Atom feeds. ## X-Launchpad-Bug The `X-Launchpad-Bug` header collates most of the other information about a bug’s status, importance, etc. It gives you slightly different information, depending on whether you’re dealing with a distribution package or a project: ### Project - `product` - `status` - `importance` - `assignee` - **For example:** `X-Launchpad-Bug: product=terminator; status=Confirmed; importance=Low; assignee=None;` ### Package - `distribution` - `sourcepackage`` - `component` - `status` - `importance` - `assignee` - **For example:** `X-Launchpad-Bug: distribution=ubuntu; sourcepackage=exaile; component=universe; status=Confirmed; importance=Medium; assignee=None;` ## Bug mail rationale The `X-Launchpad-Message-Rationale` header tells you why you’ve received the notification. You can be either: - `Assignee` - `Subscriber` - `Registrant` For example: `X-Launchpad-Message-Rationale: Assignee` An `@` symbol shows that you’re related to the bug through membership of a team: ```default X-Launchpad-Message-Rationale: Assignee @ubuntu-kernel-bugs X-Launchpad-Message-Rationale: Subscriber @ubuntu-core-dev ``` If you’re the project/package owner, the product/package name is show in parentheses: ```default X-Launchpad-Message-Rationale: Registrant (kiwi) ``` If the notification is about a duplicate bug, the rationale shows you which bug this report duplicates: ```default X-Launchpad-Message-Rationale: Assignee via Bug 1332 ``` This makes it easy to filter out bug mail about duplicate bugs. For example: let’s say this bug notification is for bug 2129. This header means you are the assignee of bug 1332, of which 2129 is a duplicate.