@munnerz: GitHub didn't allow me to request PR reviews from the following users: jsha.
Note that only jetstack members and repo collaborators can review this PR, and authors cannot review their own PRs.
In response to [this](https://github.com/jetstack/kube-lego/pull/325):
>This PR sets the user agent on the default HTTP roundtripper to help Letsencrypt diagnose abusive traffic patterns (reported here: https://github.com/jetstack/cert-manager/issues/407)
>
>/cc @simonswine @jsha
Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/devel/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.
This PR sets the user agent on the default HTTP roundtripper to help Letsencrypt diagnose abusive traffic patterns (reported here: https://github.com/jetstack/cert-manager/issues/407)
/cc @simonswine @jsha