[9.0](backport #43609) Add a how to guide about file identities #43779
+194
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So, the users have valid expectations and they are informed about pros and cons of each file identity.
Here is the preview of the new page https://docs-v3-preview.elastic.dev/elastic/beats/pull/43609/reference/filebeat/file-identity
To see the docs locally follow the steps of the official guide https://elastic.github.io/docs-builder/contribute/locally/#step-one
Closes #42264
This is an automatic backport of pull request #43609 done by Mergify.