High CPU load, manager keeps querying registry

[pluskal]

Lately, I found that docker-registry-manager keeps querying registry in loop that causes high CPU load on the server.

I am getting tens of queries per second in the log.

registry        | time="2019-09-27T07:07:29.957462528Z" level=info msg="authorized request" go.version=go1.11.2 http.request.contenttype="application/vnd.docker.distribution.manifest.v1+json" http.request.host="registry:5000" http.request.id=5b2cc150-e502-49f8-b1fa-0a296d34cfc1 http.request.method=GET http.request.remoteaddr="172.25.0.3:54388" http.request.uri="/v2/<image_name>/blobs/sha256:1a1beb2d10b244xxxx667159af55db9ad62aba07ecc92568c191" http.request.useragent="Go-http-client/1.1" vars.digest="sha256:1a1beb2d10b2xxxxx667159af55db9ad62aba07ecc92568c191" vars.name="<image_name>"

Advice how to track a cause, and remedy it is welcomed.