Chromium Issue Priorities & SLOs

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Priority definition

Five priority levels from P0-P4.

• P0 (emergency)
  • Regressions which are substantially impacting existing users, partners, or developers.
  • High-risk security issues affecting the stable channel.
• P1 (priority engineering work)
  • Major Regressions.
  • Work requiring prompt resolution.
  • Work that has to get done before the targeted release.
• P2 (active engineering work)
  • Non-urgent issues.
  • Important issues that are worked on as best effort, without a milestone.
  • Polish or bug fixing work in areas where the team has decided we want to invest
• P3 (later, want to do)
  • Something we want to do, but not right now.
  • Legitimate issues that we will work on when we have the cycles to do so.
• P4 (later, future)
  • List of things we are considering doing in the future

SLOs

The following SLOs only apply to bugs of type "Bug", "Vulnerability" (Security), "Customer Issue" or "Privacy Issue".

<table> <tr> <td>&nbsp;</td> <td><strong>Assigned</strong></td> <td><strong>Updated</strong></td> <td><strong>Fixed</strong></td> </tr> <tr> <td><strong>P0</strong></td> <td>1 business day</td> <td>Every business day</td> <td>Within 1 week</td> </tr> <tr> <td><strong>P1</strong></td> <td>1 week</td> <td>Weekly</td> <td>Within 4 weeks</td> </tr> </table>

Priorities 2-4 are out of scope for SLO.

Additionally, "Vulnerability" (Security) type issues carry the following closure SLOs based on the noted severity.

<table> <tr> <td><strong>S</strong></td> <td><strong>Closure SLO</strong></td> </tr> <tr> <td><strong>S0</strong></td> <td>1 week</td> </tr> <tr> <td><strong>S1</strong></td> <td>4 weeks</td> </tr> <tr> <td><strong>S2</strong></td> <td>12 weeks</td> </tr> <tr> <td><strong>S3+</strong></td> <td>No SLO</td> </tr> </table>

Release Blocking Issues

These are SLOs for issues that are severe enough to block a release shipping to users (see Release Blockers). They apply to bug types in the same way as the above SLOs.

<table> <tr> <td>&nbsp;</td> <td><strong>Assigned</strong></td> <td><strong>Updated</strong></td> <td><strong>Fixed</strong></td> </tr> <tr> <td><strong>Urgent</strong></td> <td>1 day</td> <td>Every day</td> <td>2 days*</td> </tr> <tr> <td><strong>Standard</strong></td> <td>2 days</td> <td>Every 2 days</td> <td>Within 5 days*</td> </tr> <tr> <td colspan="4"> <em><small>* Fixed includes CLs landed to all relevant release branches.</small></em> </td> </tr> </table>