I know of at least two issues with our ptr record generation:
- records are generated with project id rather than project name (e.g. instance-mail.f6ec9c0903d44b86bfbc7072bb77c7d6.wmcloud.org. -- not very human readable)
- manually-created pointer records (see for example T421025) are clobbered by the automatic records. We need some way to support both, or prevent the clobbering.