• Launchpad entry: https://launchpad.net/launchpad/+spec/malone-and-blueprint

• Created: 2006-05-11 by MatthewPaulThomas

• Contributors: MatthewPaulThomas

Merging Bugs and Blueprints into a single tracker will make Launchpad more functional and easier to use, make scheduling easier for developers, simplify the codebase, and make Launchpad development faster. Bug reports, feature requests, and other to-dos can be created, processed, scheduled, and resolved the same way. This should not be implemented as a whole new tracker, but by porting missing features from Blueprints to Bugs, then rebranding and migrating. This specification covers (1) the tracker itself, (2) how representative projects would use it, and (3) how we will orchestrate the implementation and migration.

Rationale

Tracking bug reports and feature requests in separate systems makes tasks hard to report, hard to track, and hard to schedule, subtly discourages quality in projects that use Launchpad, and impedes development of Launchpad itself. These points are explained, with many examples, in the full rationale.

Research

We have carried out interviews and statistical analysis of the projects that most use blueprints. (Unfortunately, because some of these projects are private, the data is also private.)

The tracker

Migration for representative projects

• In Ubuntu, people propose hundreds of blueprints for discussion at the next Ubuntu Developer Summit; that number is limited by the obscurity of the function. Managers approve or decline blueprints for UDS, renaming them to fit into semi-arbitrary tracks. The Summit scheduler arranges sessions based on who has registered their attendance and marked themselves as “essential” subscribers. During UDS sessions, participants assemble work items with other notes as plain text in Gobby, then up to a week or two later, transfer them to the blueprint whiteboard. Sometimes a blueprint links to a specification on the Ubuntu wiki. The Unity Design team avoids blueprints, instead using a dummy project to track feature design separately from implementation in bug reports. For all other teams, Ubuntu drivers approve or decline the finished blueprints. If approved, a blueprint’s work items and linked bug reports appear on burndown charts. As work items are updated during the cycle, Launchpad mails whiteboard diffs to the subscribers. If a feature takes more than six months, sometimes the blueprint is reused for the next UDS, and sometimes it is superseded.

  <rickspencer3> jcastro, where can I see some organized lists of the blueprints registred to date for Natty? ... <jcastro> https://blueprints.edge.launchpad.net/sprints/uds-n ... <jcastro> the link at the bottom takes you to the "pending" ones people are submitting ... <jcastro> which is the link you'll want to check regularly <rickspencer3> jcastro, can I see them listed by track? <rickspencer3> also, I'd like to be able to list them by team if possible <rickspencer3> jcastro, does stuff like this work: https://blueprints.edge.launchpad.net/sprints/uds-n?searchtext=*-foundations-* <rickspencer3> ? <jcastro> rickspencer3: clicking on the column sorts them by name, which is are the tracks <jcastro> yes, it does ... <jcastro> rickspencer3: as long as you stick to the naming convention it should be fine

  In the new tracker, people (would this need restricting?) could nominate any issue to be discussed at UDS. (Would the sprint tracker still be part of Launchpad?) Drivers would approve or decline issues for UDS based not on whether they were features, but on whether they were complex enough to need in-person discussion. During a UDS session, participants would update the issue description directly and add/remove work items. Drivers would approve or decline issues and/or individual work items for the release, and allocate them to milestones if desired. Launchpad itself would display burndown charts for the Ubuntu series as a whole, for milestones, for teams, and for individuals.

• Linaro processes are complex but their presentation is in flux. As with Ubuntu, features are proposed, and the Technical Steering Committee approves or declines them, for discussion at six-monthly developer summits. Overall changes targeted for a release are described as technical requirements (example). Blueprints representing these have a tr- prefix, sometimes depending on other blueprints from both Linaro and Ubuntu. As with Ubuntu, blueprints have work items tracked on burndown charts, and also on elaborate external dashboards that track both definition status and implementation status. Separate charts track weekly progress for each technical requirement. Project members are currently debating whether to request fields for person-hours estimated vs. expended in Launchpad for more precise tracking.

In the new tracker, people would nominate issues for discussion at an LDS. The Technical Steering Committee would have a team-controlled “tr” tag for marking issues as technical requirements, so that they could be displayed as a separate list, and contributors would list work items in other dependent issue reports. Launchpad could show overall progress of the release, but progress of technical requirements would still need to be displayed using an external tool. Estimated person-hours could be entered in Launchpad either for a whole issue, or for its individual work items.

• Drizzle heavily uses both work items and milestones, but its “burndown chart” does not track progress towards a milestone.

In the new tracker, contributors could easily see a burndown chart for each milestone, as well as an issue status chart for the project as a whole. Work items would be entered inside issue reports.

• A small project typically uses blueprints sporadically, if at all. When it does,

Random notes

Bugs and Blueprints should be merged into Issues, a unified application for handling bug reports, feature requests, and other to-dos. Projects should be able to choose what kind of issues they want to use the issue tracker for, without having to learn separate applications.

Dependencies

Some bug and issue trackers include dependency tracking. Unfortunately dependencies are used to express a variety of different relationships:

• Work on X can't begin until Y is finished.
• Work on X can begin, but can't finish until Y is finished.
• X could be finished without Y being finished, but the software wouldn't make sense to users in that state.
• X might still be an issue, but it's difficult to tell because of Y.
• Fixing Y would be one way of fixing X, but not the only way.
• X is divided into two tasks, Y and Z.

When people assume that all dependencies are of the first sort, development is slowed unnecessarily.

FogBugz doesn't record dependencies, because "on software teams, it's almost always the case that the team can keep working even when there's a dependency. Software developers have a great deal of flexibility in the order in which things are done, unlike, say, a construction crew building a house. Because it's so easy to create simple stub functions as placeholders, with software, it's perfectly reasonable to build the roof before the foundation is poured."

There are also other interesting relationships between issues, that cannot reasonably be tracked as dependencies:

• If X was fixed, Y would become invalid.
• Y is similar to X, and testers should be careful not to confuse them.
• Y is a regression of X.
• Y is the unfixed remainder of X.

With all these relationship types, the benefit of having a specific field for them in Launchpad is outweighed by the cost of the extra complexity. And this applies exactly as much to feature requests as it does to bugs. Therefore issue relationships should be recorded using free-form text in the issue's description, with Launchpad automatically linking issue numbers as it does now for bug numbers.

Data migration: Once blueprints are assigned issue numbers, blueprint dependencies should be converted to sentences at the end of the issue description.

Delegation

For effective issue tracking, it is important for all issues assigned to someone to represent things they are able to work on right now. When an issue is blocked on someone else, it should appear in that person's task list, and be downplayed in your own. Therefore Launchpad should know about delegation, or temporary reassignment.

• A specification in the Ready state may be delegated to drivers for approval, before being returned for implementation.
• A smaller bug fix that affects the user interface may be delegated to a UI designer for sign-off, before being returned for implementation.
• A code change may be implemented and then delegated to the review team for review, before being returned for committal.
• Close to a major release, a reviewed code change may be delegated to a drivers team to gauge risk vs. reward, before being returned for committal to the release branch and/or the trunk.

Status

Issues should have six possible statuses.

• Unconfirmed: Not yet investigated by someone qualified to determine its coherence.

• Declined: Not appropriate or relevant for this project.

• Incomplete: May be appropriate, but is missing information about the precise problem — for example, reliable steps to reproduce, a testcase, or hardware details.

• Ready: The issue is described well enough, and is approved if necessary, so that work can begin. (Cf. BugzillaWorkflowImprovements.)

• In Progress: Actively being designed, implemented, or fixed. (Some projects and/or assignees may not bother with this status.)

• Done: Fixed, implemented, or achieved. Any unresolved issues have been recorded separately. For versioned things (such as software), the version/versions in which the issue is resolved should be recorded.

Issues marked as "Declined" or "Done" should continue appearing in search results for a period afterward (defaulting to six months, but configurable per-project to suit the typical upgrade cycle of the project's users). This would perform almost exactly the same duplicate-reducing function as "Fix Committed" was intended but failed to do, and as "Won't Fix" does, but in a much simpler way.

Data migration:

• “New” -> “Unconfirmed” (because “New” is misleading)

• “Invalid” -> “Declined” (because “Invalid” is needlessly harsh)

• "Won't Fix" -> "Declined"

• “Opinion” -> “Declined” (because something being a matter of opinion is orthogonal to whether the maintainer will accept it)

• “Confirmed” -> “Unconfirmed” (superseded by users-affected count)

• "Triaged" -> "Ready" (because the name "Triaged" is both misleading and over-specific)

• "Fix Committed" -> "Done" with "context-target-name-committed" tag (for easing migration of projects that were purposefully distinguishing between Committed and Released)

• "Fix Released" -> "Done" with "context-target-name-released" tag

Importance

Issues should have the same set of importance values as Bugs had previously, except without Wishlist. Whether something is a wishlist item is orthogonal to how important it is.

Work items

As a workaround for poor tracking in Blueprint, the separate work items tracker has been grafted on top for large projects (Ubuntu, Linaro, Drizzle), with burndown charts. Work items are entered, and edited, as lines of text in blueprint whiteboards. Bug reports are (at least currently) too much work to use as work items. Any combined issue tracker will need to satisfy the same requirements.

Implementation

This would not be implemented as a whole new tracker. The overall implementation plan would be:

• port missing features from Blueprints to Bugs, rolling them out as ready
• implement the rebranding of "Bugs" to "Issues" and the hiding of "Blueprints"
• implement migration of all current blueprints to issue reports
• simultaneously roll out the rebranding and perform the migration
  • possibly the migration can be done in the hours after the rollout
• once it's all working, implement the removal of the dead code and DB records.

Code changes

Schema changes

Migration

• blueprint "names" become issue nicknames
  • requires uniqueifying nicknames
• bugs with "Wishlist" importance reset to "Undecided" for proper triage

• URL redirects (https://launchpad.net/bugs/nnn should continue to work)

• "Blocked" should be represented by an unresolved dependent issue

Unresolved issues

• What to do with "informational" specifications?

• Bug 136103: Suggestion about bug types

• Bug 176431: Better organization/segregation of wishlist items

• Could "Declined" and "Done" be merged into "Closed"? Is there a functional distinction between the two? For example, if a bug is reported about a feature that is later removed, should the bug be considered invalid or fixed? Google Code Hosting makes no distinction by default. And Ubuntu package changelogs "Close" bugs, rather than fixing some and invalidating others.
• How should "Does not affect software X" (or "Does not affect software X version Y") be represented?