Indeed, the https://prguidelines.services.atlassian.com is currently unavailable because the PR Guidelines functionality was discontinued on June 8th. The decision was made due to low adoption and usage.
The discontinuation was announced in the following article:
Please, feel free to share any additional questions or concerns regarding this subject.
Beginning on April 4th, we will be implementing push limits. This means that your push cannot be completed if it is over 3.5 GB. If you do attempt to complete a push that is over 3.5 GB, it will fail...
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