Tracking issue for reorganizing labels in the rustfmt repo

Context: #t-rustfmt > Triage labels. We should do a survey pass of open issues and PRs to assess current situation. This is the subtask of assessing and reorganizing what labels we have, to make triaging easier.

[!WARNING]

Work-in-progress, will be continuously updated.

Planned reorganizations

• Introduce a F-* (expected impact on formatting output and configuration) family of labels.
  • https://github.com/rust-lang/rustfmt/labels/F-impacts-default-format-config
  • https://github.com/rust-lang/rustfmt/labels/F-impacts-stable-formatted-code
  • https://github.com/rust-lang/rustfmt/labels/F-impacts-stable-unformatted-code
  • https://github.com/rust-lang/rustfmt/labels/F-impacts-unstable-code
  • https://github.com/rust-lang/rustfmt/labels/F-no-formatting-impact
  • https://github.com/rust-lang/rustfmt/labels/F-untriaged-formatting-impact
• Introduce a C-* ("category") family of labels (mirroring r-l/r) for categorizing issue kinds.
• Introduce a B-* ("blocked") family of labels to split https://github.com/rust-lang/rustfmt/labels/blocked more specific block reasons.
  • https://github.com/rust-lang/rustfmt/labels/B-prerequisite-rustc-changes
  • https://github.com/rust-lang/rustfmt/labels/B-has-concerns (FIXME: S-has-concerns)
  • https://github.com/rust-lang/rustfmt/labels/B-prerequisite-changes
  • https://github.com/rust-lang/rustfmt/labels/B-needs-style-edition-gate
  • https://github.com/rust-lang/rustfmt/labels/B-t-style-decision
• Introduce I-* ("indicator"/"important") family of labels (not intended to fully mirror r-l/r): I-lang-stabilization (for lang feature stabilizations), I-rustfmt-nominated (for rustfmt team discussion)
• Check if we can use S-waiting-on-{author,reviewer} binary label like r-l/r instead of pr-{not-reviewed,follow-up-review-pending} + s-waiting-on-author.
• Split https://github.com/rust-lang/rustfmt/labels/pr-on-hold into more specific reasons. (Survey what the common reasons are first.)
• Mirror https://github.com/rust-lang/rustfmt/labels/needs-rfc

Planned cleanups

• Reassess current area A-* family of labels.

Other tasks

• Document label families as part of issue / PR triaging in https://github.com/rust-lang/rustfmt/issues/6686.
• Investigate how priorities are determined, and if P-* family of labels have different meanings for issues vs PRs.
• Investigate https://github.com/rust-lang/rustfmt/labels/community%20driven label.
• Investigate https://github.com/rust-lang/rustfmt/labels/help%20wanted label.

Remarks on current labels

Pending.

Start with the linked Zulip discussion and the current GitHub label list, then review the open issues and PRs referenced by the planned reorganizations. Track which label families and investigations remain incomplete; the work is done when the survey, label cleanup, and any linked triage documentation tasks have clear conclusions.