Don't add timestamp to registry logs if log format is JSON
In !2615 (merged), Gitaly was configured such that svlogd
does not prefix logs with a timestamp when the logging format is JSON.
We now have the option to configure the registry to use JSON logging.
We should also not add the timestamp prefix in this case.
This should be configured in https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/registry/templates/default/sv-registry-log-run.erb
Making this as a Cloud Spend issue as having structured logs on the registry will enable us to investigate usage patterns on the registry. See https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/6377 for details.
Edited by Andrew Newdigate