Hello,
Product documentation has been moved to https://docs.hitachivantara.com, login with your account credentials and then search on your desire document, you may not get all documentation under a single folder called PDL but all necessary documents which are supposed to be under PDL folder will be displayed in your search result, below is an example for Ops Center products.

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Prasenjit Chatterjee
Software Engineer- Test
Hitachi Vantara
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