Google Cloud Artifact Registry清理策略未生效问题求助

仓库清理策略配置 #

我拥有一个名为staging的Artifact Registry仓库，其清理策略配置如下：
执行命令：

gcloud artifacts repositories list-cleanup-policies staging

输出结果：

Listing items under project XXX, location us-east1, repository staging.

Dry run is disabled.
[
  {
    "action": {
      "type": "KEEP"
    },
    "mostRecentVersions": {
      "keepCount": 20
    },
    "name": "keeplast20images"
  }
]

问题现象 #

该策略已设置两周，但仓库内的镜像标签数量仍在持续增长，部分镜像的标签数量已超过100个，没有任何标签被删除。

排查操作 #

我尝试执行以下命令获取审计日志，但未得到任何输出：

gcloud logging read 'protoPayload.serviceName="artifactregistry.googleapis.com" AND protoPayload.request.parent="projects/XXX/locations/us-east1/repositories/staging" AND protoPayload.request.validateOnly=true' \
    --resource-names="projects/XXX" \
    --project=XXX

内容的提问来源于stack exchange，提问作者Yashar