document restriction of external-external credential source linking

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Jake McDermott 2019-02-28 10:28:24 -05:00
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@ -36,7 +36,9 @@ the Machine Credential.
Note that you can perform these lookups on *any* credential field - not just
the `password` field for Machine credentials. You could just as easily create
an AWS credential and use lookups to retrieve the Access Key and Secret Key
from an external secret management system.
from an external secret management system. Also note that external credential
sources cannot ever be used to look up secrets for other external credential
sources.
Writing Custom Credential Plugins
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