Gcloud Run - Find latest revision's name

I'm trying to find the name of the latest revision of a gcloud run service, so that I can change its assigned traffic when running a Jenkins pipeline. I've tried the gcloud run revisions list with the --limit, --sort-by, --format flags, but I'm not getting what I expected. When limiting to only one result, the second to last revision comes up instead of the latest one. Am I doing anything wrong?

The following are the gcloud commands I've ran coupled with their output.

>gcloud run revisions list --service service-foo --platform managed --region europe-west4 --limit 2 --sort-by ~creationTimestamp --format="value(name,creationTimestamp)"
service-foo-00302-luq     2021-08-27T11:13:39.883161Z
service-foo-00300-san     2021-08-26T15:45:33.351646Z

>gcloud run revisions list --service service-foo --platform managed --region europe-west4 --limit 1 --sort-by ~creationTimestamp --format="value(name,creationTimestamp)"
service-foo-00300-san     2021-08-26T15:45:33.351646Z

>gcloud run revisions list --service service-foo --platform managed --region europe-west4 --limit 1 --sort-by creationTimestamp --format="value(name,creationTimestamp)"
service-foo-00300-san     2021-08-26T15:45:33.351646Z

Solution

There does seem to currently be a bug for the revisions subgroup's list command using both the Google Cloud Platform (GCP) SDK (gcloud):

gcloud run revisions list \
--format="value(metadata.name)" \
--platform=managed \
--region=$CLOUD_RUN_SERVICE_REGION \
--service=$CLOUD_RUN_SERVICE_NAME \
--sort-by="~metadata.creationTimestamp"

#=>

$CLOUD_RUN_LATEST_REVISION
$CLOUD_RUN_PREVIOUS_REVISION
. . .

when using the --limit flag:

gcloud run revisions list \
--format="value(metadata.name)" \
--limit=1 \
--platform=managed \
--region=$CLOUD_RUN_SERVICE_REGION \
--service=$CLOUD_RUN_SERVICE_NAME \
--sort-by="~metadata.creationTimestamp"

#=>

$CLOUD_RUN_PREVIOUS_REVISION

and the GCP REST API with the limit query param.:

curl \
--location \
--request GET "https://$CLOUD_RUN_SERVICE_REGION-run.googleapis.com/apis/serving.knative.dev/v1/namespaces/$GCP_PROJECT_NAME/revisions?limit=1" \
--header "Authorization: Bearer $(gcloud auth print-access-token)"

#=>

{
  . . .
  "items": [
    {
      . . .
      "metadata": {
        "name": "$CLOUD_RUN_PREVIOUS_REVISION",
        . . .
      },
      . . .
    },
    . . .
  ]
}

with the latest gcloud version:

gcloud version

#=>

Google Cloud SDK 357.0.0
. . .

However, there is a way to get both the latest created and ready revisions of a Cloud Run service using the services subgroup instead of the revisions subgroup:

gcloud run services describe $GCLOUD_RUN_SERVICE_NAME \
--format="value(status.latestCreatedRevisionName)" \
--platform=managed \
--region=$CLOUD_RUN_SERVICE_REGION

#=>

$CLOUD_RUN_LATEST_REVISION

and:

gcloud run services describe $GCLOUD_RUN_SERVICE_NAME \
--format="value(status.latestReadyRevisionName)" \
--platform=managed \
--region=$CLOUD_RUN_SERVICE_REGION

#=>

$CLOUD_RUN_LATEST_REVISION

You can read more about the describe command for the services subgroup here.