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5983d58d7c
Log based on registry known-poor support of HEAD in checking container manifest. Some private registries do not support HEAD (E.G. GitLab Container Registry). With the current config, this log message is causing a notification to be sent for each container hosted in a registry lacking HEAD support. log.Debug or log.Warning for failed HTTP HEAD-check based on registry hostname where HEAD-check is known to fail. For Docker Hub, a failed HEAD leading to a "regular pull" may count against a user's call-quota whereas other registry implementations do not support HEAD, or whose container manifest may be in a different location.