goharbor/harbor

Add Webhook Trigger for “Tag Created” Event

Open

#22640 opened on Dec 15, 2025

View on GitHub
 (6 comments) (0 reactions) (0 assignees)Go (28,490 stars) (5,235 forks)batch import
Stalehelp wanted

Description

Discussed in https://github.com/goharbor/harbor/discussions/22635

Originally posted by yashid-mohamed December 11, 2025 I’d like to request a new webhook event type that triggers specifically when a tag is created (without requiring the artifact itself to be pushed again).

Problem

When performing tag promotion (e.g., promoting an existing digest from 0.403.0 → 0.403.0-prod) using the Harbor API or UI, Harbor currently does not emit any webhook for this action.

This creates a gap for CI/CD pipelines and downstream automation tools that rely on webhook notifications to react to new tags. Since no new artifact is pushed and no scan/build occurs, none of the existing webhook types fire.

Use Case

Many promotion workflows rely on copying or creating tags inside Harbor (to preserve digest immutability and avoid re-pushing images). Examples:

  • Promotion from dev → prod
  • Tagging releases in automation pipelines
  • Triggering deployments based on tag creation

Without a webhook event for tag creation, external systems must continuously poll Harbor, which is inefficient.

Contributor guide

Tech stack
gorest api
Domain
backendapici cd
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Go programmingHarbor webhook system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the existing webhook event types in the Harbor codebase, likely in `src/core/api/webhook.go` or similar. Understand how artifact push events are emitted and replicate for tag creation. Check discussions and existing PRs for similar additions.