The documentation for setting up pipelines, specifically when adding a known host address here, mentions Valid IP addresses for Bitbucket Pipelines build environments but none of those listed worked only ones under Valid IP addresses for bitbucket.org, api.bitbucket.org, and altssh.bitbucket.org worked.
Error when trying to add an IP from the Bitbucket Pipelines build environments section:
Unable to fetch fingerprints, check host SSH connection and try again
You need to the Known hosts feature if you are connecting from the BitBucket Pipelines to some external hosts, you don't need to use it to set up a normal pipeline running solely in the BitBucket Pipelines infrastructure.
As the page you mentioned states, this is for configuring your firewall to allow connections from your internal infrastructure to BitBucket.
I'm not sure what you are trying to achieve, so if you are trying to resolve some Pipeline error, please paste a definition of your pipeline or a description of a problem you are facing.
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