UserAgent is a valid user agent string as defined by the HTTP specification https://tools.ietf.org/html/rfc1945#section-10.15, this is used to identify what unique version of the Exporter has been interacting with Couchbase server.

This will generate things like "1.0.0 (build 123)" and should be used for binary version strings so we can tell exactly which build (and by extension commit) is being used.

WithBuildNumberAndRevision gives full debug information, used primarily for CLI commands.

This will generate things like 1.0.0 and 1.0.0-beta1 and should be used for things like docker images.